Corrected following cards:

AEther Membrane
Abomination
Basalt Golem
Cockatrice
Contempt
Deathgazer
Defiant Vanguard
Dread Specter
Dread Wight
Goblin Sappers
Greater Werewolf
Heat Stroke
Infernal Medusa
Ohran Viper
Sawtooth Ogre
Serpentine Basilisk
Silent Assassin
Sosuke, Son of Seshiro
Tangle Asp
Thicket Basilisk
Time Elemental
Tolarian Entrancer
Venom
Wall of Tears

[combatends]
 ==> 
[combatends once]

projects/mtg/bin/Res/sets/primitives/mtg.txt

@@ -49,7 +49,7 @@ type=Enchantment
 [card]
 name=AEther Membrane
 abilities=defender,reach
-auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends] moveTo(ownerhand)
+auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] moveTo(ownerhand)
 text=Defender; reach (This creature can block creatures with flying.) -- Whenever AEther Membrane blocks a creature, return that creature to its owner's hand at end of combat.
 mana={1}{R}{R}
 type=Creature
@@ -224,7 +224,7 @@ type=Instant
 [/card]
 [card]
 name=Abomination
-auto=@combat(blocking,blocked) source(this) from(creature[green;white]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature[green;white]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Abomination blocks or becomes blocked by a green or white creature, destroy that creature at end of combat.
 mana={3}{B}{B}
 type=Creature
@@ -4962,7 +4962,7 @@ toughness=2
 [card]
 name=Basalt Golem
 auto=cantbeblockedby(creature[artifact])
-auto=@combat(blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends] sacrifice && phaseaction[combatends once] token(Wall,Artifact Creature Wall,0/2,defender) opponent
+auto=@combat(blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] sacrifice && phaseaction[combatends once] token(Wall,Artifact Creature Wall,0/2,defender) opponent
 text=Basalt Golem can't be blocked by artifact creatures. -- Whenever Basalt Golem becomes blocked by a creature, that creature's controller sacrifices it at end of combat. If the player does, he or she puts a 0/2 colorless Wall artifact creature token with defender onto the battlefield.
 mana={5}
 type=Artifact Creature
@@ -11971,7 +11971,7 @@ toughness=3
 [card]
 name=Cockatrice
 abilities=flying
-auto=@combat(blocking,blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Flying -- Whenever Cockatrice blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.
 mana={3}{G}{G}
 type=Creature
@@ -12432,7 +12432,7 @@ type=Enchantment
 [card]
 name=Contempt
 target=creature
-auto=@combat(attacking) source(mytgt) :all(trigger[to]) phaseaction[combatends] moveTo(ownerhand) && phaseaction[combatends] moveTo(ownerhand) all(this)
+auto=@combat(attacking) source(mytgt) :all(trigger[to]) phaseaction[combatends once] moveTo(ownerhand) && phaseaction[combatends once] moveTo(ownerhand) all(this)
 text=Enchant creature -- Whenever enchanted creature attacks, return it and Contempt to their owners' hands at end of combat.
 mana={1}{U}
 type=Enchantment
@@ -14879,7 +14879,7 @@ toughness=6
 [/card]
 [card]
 name=Deathgazer
-auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Deathgazer blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.
 mana={3}{B}
 type=Creature
@@ -15519,8 +15519,8 @@ type=Instant
 [/card]
 [card]
 name=Defiant Vanguard
-auto=@combat(blocking) source(this):all(trigger[to]) phaseaction[combatends] destroy
-auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking) source(this):all(trigger[to]) phaseaction[combatends once] destroy
+auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] destroy
 auto={5}{T}:moveTo(myBattlefield) target(rebel[manacost<=4]|mylibrary)
 text=When Defiant Vanguard blocks, at end of combat, destroy it and all creatures it blocked this turn. -- {5}{T}: Search your library for a Rebel permanent card with converted mana cost 4 or less and put it onto the battlefield. Then shuffle your library.
 mana={2}{W}
@@ -17314,7 +17314,7 @@ toughness=9
 [/card]
 [card]
 name=Dread Specter
-auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Dread Specter blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.
 mana={3}{B}
 type=Creature
@@ -17342,8 +17342,8 @@ toughness=2
 [card]
 name=Dread Wight
 auto=lord(creature[counter{0/0.1.Paralyzation}]) doesnotuntap
-auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends] tap oneshot
-auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends] counter(0/0,1,Paralyzation) oneshot
+auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] tap oneshot
+auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] counter(0/0,1,Paralyzation) oneshot
 auto=lord(creature[counter{0/0.1.Paralyzation}]) {4}:counter(0/0,-1,Paralyzation)
 text=At end of combat, put a paralyzation counter on all creatures blocking or blocked by Dread Wight and tap those creatures. They gain "If this creature has a paralyzation counter on it, it doesn't untap during its controller's untap step" and "{4}: Remove a paralyzation counter from this creature."
 mana={3}{B}{B}
@@ -26574,8 +26574,8 @@ toughness=1
 [/card]
 [card]
 name=Goblin Sappers
-auto={R}{R}{T}:unblockable target(creature) && phaseaction[combatends] destroy && all(this) phaseaction[combatends,sourceinplay] destroy
-auto={R}{R}{R}{R}{T}:unblockable target(creature) && phaseaction[combatends] destroy
+auto={R}{R}{T}:unblockable target(creature) && phaseaction[combatends once] destroy && all(this) phaseaction[combatends,sourceinplay] destroy
+auto={R}{R}{R}{R}{T}:unblockable target(creature) && phaseaction[combatends once] destroy
 text={R}{R}, {T}: Target creature you control is unblockable this turn. Destroy it and Goblin Sappers at end of combat. -- {R}{R}{R}{R}, {T}: Target creature you control is unblockable this turn. Destroy it at end of combat.
 mana={1}{R}
 type=Creature
@@ -27620,7 +27620,7 @@ toughness=4
 [/card]
 [card]
 name=Greater Werewolf
-auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends] counter(-0/-2,1) oneshot
+auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends once] counter(-0/-2,1) oneshot
 text=At end of combat, put a -0/-2 counter on all creatures blocking or blocked by Greater Werewolf.
 mana={4}{B}
 type=Creature
@@ -29397,7 +29397,7 @@ type=Sorcery
 [/card]
 [card]
 name=Heat Stroke
-auto=@combat(blocking,blocked) source(creature):all(trigger[to]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(creature):all(trigger[to]) phaseaction[combatends once] destroy
 text=At end of combat, destroy each creature that blocked or was blocked this turn.
 mana={2}{R}
 type=Enchantment
@@ -31802,8 +31802,8 @@ type=Sorcery
 [/card]
 [card]
 name=Infernal Medusa
-auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends] destroy
-auto=@combat(blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] destroy
+auto=@combat(blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Infernal Medusa blocks a creature, destroy that creature at end of combat. -- Whenever Infernal Medusa becomes blocked by a non-Wall creature, destroy that creature at end of combat.
 mana={3}{B}{B}
 type=Creature
@@ -45152,7 +45152,7 @@ toughness=3
 [/card]
 [card]
 name=Ohran Viper
-auto=@combatdamaged(creature) from(this):all(trigger[to]) phaseaction[combatends] destroy
+auto=@combatdamaged(creature) from(this):all(trigger[to]) phaseaction[combatends once] destroy
 auto=@combatdamaged(player) from(this):may draw:1 controller
 text=Whenever Ohran Viper deals combat damage to a creature, destroy that creature at end of combat. -- Whenever Ohran Viper deals combat damage to a player, you may draw a card.
 mana={1}{G}{G}
@@ -55057,7 +55057,7 @@ toughness=1
 [/card]
 [card]
 name=Sawtooth Ogre
-auto=@combat(blocking,blocked) source(this) from(creature[-black]):all(trigger[from]) phaseaction[combatends] damage:1 oneshot
+auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] damage:1
 text=Whenever Sawtooth Ogre blocks or becomes blocked by a creature, Sawtooth Ogre deals 1 damage to that creature at end of combat.
 mana={2}{R}{R}
 type=Creature
@@ -56687,7 +56687,7 @@ toughness=*
 name=Serpentine Basilisk
 facedown={3}
 autofacedown={1}{G}{G}:morph
-auto=@combatdamaged(creature) from(this):all(trigger[to]) phaseaction[combatends] destroy
+auto=@combatdamaged(creature) from(this):all(trigger[to]) phaseaction[combatends once] destroy
 text=Whenever Serpentine Basilisk deals combat damage to a creature, destroy that creature at end of combat. -- Morph {1}{G}{G} (You may cast this face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
 mana={2}{G}{G}
 type=Creature
@@ -58262,7 +58262,7 @@ type=Instant
 [/card]
 [card]
 name=Silent Assassin
-auto={3}{B}:target(creature[blocking]) phaseaction[combatends] destroy
+auto={3}{B}:target(creature[blocking]) phaseaction[combatends once] destroy
 text={3}{B}: Destroy target blocking creature at end of combat.
 mana={B}{B}
 type=Creature
@@ -60804,7 +60804,7 @@ type=Sorcery
 [card]
 name=Sosuke, Son of Seshiro
 auto=lord(other snake|myBattlefield) 1/0
-auto=@combatdamaged(creature) from(warrior|myBattlefield):all(trigger[to]) phaseaction[combatends] destroy
+auto=@combatdamaged(creature) from(warrior|myBattlefield):all(trigger[to]) phaseaction[combatends once] destroy
 text=Other Snake creatures you control get +1/+0. -- Whenever a Warrior you control deals combat damage to a creature, destroy that creature at end of combat.
 mana={2}{G}{G}
 type=Legendary Creature
@@ -65455,7 +65455,7 @@ type=Instant
 [/card]
 [card]
 name=Tangle Asp
-auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Tangle Asp blocks or becomes blocked by a creature, destroy that creature at end of combat.
 mana={1}{G}
 type=Creature
@@ -66782,7 +66782,7 @@ type=Sorcery
 [/card]
 [card]
 name=Thicket Basilisk
-auto=@combat(blocking,blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(this) from(creature[-wall]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Whenever Thicket Basilisk blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.
 mana={3}{G}{G}
 type=Creature
@@ -67807,8 +67807,8 @@ type=Sorcery
 [/card]
 [card]
 name=Time Elemental
-auto=@combat(attacking) source(this):phaseaction[combatends] damage:5 controller && phaseaction[combatends,sourceinplay] sacrifice
-auto=@combat(blocking) source(this):phaseaction[combatends] damage:5 controller && phaseaction[combatends,sourceinplay] sacrifice
+auto=@combat(attacking) source(this):phaseaction[combatends once] damage:5 controller && phaseaction[combatends,sourceinplay] sacrifice
+auto=@combat(blocking) source(this):phaseaction[combatends once] damage:5 controller && phaseaction[combatends,sourceinplay] sacrifice
 auto={2}{U}{U}{T}:moveTo(ownerhand) target(*[-enchanted])
 text=When Time Elemental attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you. -- {2}{U}{U}, {T}: Return target permanent that isn't enchanted to its owner's hand.
 mana={2}{U}
@@ -68072,7 +68072,7 @@ toughness=4
 [/card]
 [card]
 name=Tolarian Entrancer
-auto=@combat(blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends] moveTo(opponentBattlefield)
+auto=@combat(blocked) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] moveTo(opponentBattlefield)
 text=Whenever Tolarian Entrancer becomes blocked by a creature, gain control of that creature at end of combat.
 mana={1}{U}
 type=Creature
@@ -71302,7 +71302,7 @@ toughness=2
 [card]
 name=Venom
 target=creature
-auto=@combat(blocking,blocked) source(mytgt) from(creature[-wall]):all(trigger[from]) phaseaction[combatends] destroy
+auto=@combat(blocking,blocked) source(mytgt) from(creature[-wall]):all(trigger[from]) phaseaction[combatends once] destroy
 text=Enchant creature -- Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat.
 mana={1}{G}{G}
 type=Enchantment
@@ -73531,7 +73531,7 @@ toughness=6
 [card]
 name=Wall of Tears
 abilities=defender
-auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends] moveTo(ownerhand)
+auto=@combat(blocking) source(this) from(creature):all(trigger[from]) phaseaction[combatends once] moveTo(ownerhand)
 text=Defender (This creature can't attack.) -- Whenever Wall of Tears blocks a creature, return that creature to its owner's hand at end of combat.
 mana={1}{U}
 type=Creature