diff --git a/projects/mtg/bin/Res/sets/primitives/mtg.txt b/projects/mtg/bin/Res/sets/primitives/mtg.txt
index da2f5e215..a1ed01139 100644
--- a/projects/mtg/bin/Res/sets/primitives/mtg.txt
+++ b/projects/mtg/bin/Res/sets/primitives/mtg.txt
@@ -39610,7 +39610,7 @@ toughness=1
 name=Form of the Dragon
 auto=@each my upkeep:damage:5 target(creature,player)
 auto=@each end:lifeset:5
-auto=lord(creature[-flying]|opponentBattlefield) cantattack
+auto=lord(creature|opponentBattlefield) flyersonly
 text=At the beginning of your upkeep, Form of the Dragon deals 5 damage to target creature or player. -- At the beginning of each end step, your life total becomes 5. -- Creatures without flying can't attack you.
 mana={4}{R}{R}{R}
 type=Enchantment
@@ -64668,7 +64668,7 @@ toughness=2
 [/card]
 [card]
 name=Magus of the Moat
-auto=lord(creature[-flying]) cantattack
+auto=lord(creature) flyersonly
 text=Creatures without flying can't attack.
 mana={2}{W}{W}
 type=Creature
@@ -69545,7 +69545,7 @@ toughness=1
 [/card]
 [card]
 name=Moat
-auto=lord(creature[-flying]) cantattack
+auto=lord(creature) flyersonly
 text=Creatures without flying can't attack.
 mana={2}{W}{W}
 type=Enchantment
@@ -106044,7 +106044,8 @@ toughness=2
 name=Stormtide Leviathan
 abilities=islandwalk
 auto=lord(land) transforms((island))
-auto=lord(creature[-flying;-islandwalk]) cantattack
+auto=lord(creature[-islandwalk]) cantattack
+auto=lord(creature) flyersonly
 text=Islandwalk -- All lands are Islands in addition to their original type. -- Creatures without flying or islandwalk can't attack.
 mana={5}{U}{U}{U}
 type=Creature
@@ -109798,7 +109799,7 @@ type=Legendary Land
 [/card]
 [card]
 name=Teferi's Moat
-auto=chooseacolor lord(creature[chosencolor&-flying]|opponentBattlefield) cantattack chooseend
+auto=chooseacolor lord(creature[chosencolor]|opponentBattlefield) flyersonly chooseend
 text=As Teferi's Moat enters the battlefield, choose a color. -- Creatures of the chosen color without flying can't attack you.
 mana={3}{W}{U}
 type=Enchantment
@@ -111800,7 +111801,7 @@ type=Sorcery
 [card]
 name=Thoughtseize
 target=player
-auto=reveal:type:*:targetedpersonshand revealzone(targetedpersonshand) optionone name(choose discards) target(*[-land]|reveal) moveto(ownerhand) and!( transforms((,newability[reject],newability[all(*[-land]|reveal) moveto(ownerhand) and!(reject)!])) oneshot )! optiononeend optiontwo name(look) target(<1>*|reveal) moveto(ownerhand) and!( all(*|reveal) moveto(ownerhand) )!  optiontwoend afterrevealed transforms((,newability[life:-2 controller])) oneshot afterrevealedend revealend
+auto=reveal:type:*:targetedpersonshand revealzone(targetedpersonshand) optionone name(choose discards) target(*[-land]|reveal) moveto(ownerhand) and!( transforms((,newability[reject],newability[all(*[-land]|reveal) moveto(ownerhand)])) oneshot )! optiononeend optiontwo name(look) target(<1>*|reveal) moveto(ownerhand) and!( all(*|reveal) moveto(ownerhand) )!  optiontwoend afterrevealed transforms((,newability[life:-2 controller])) oneshot afterrevealedend revealend
 text=Target player reveals his or her hand. You choose a nonland card from it. That player discards that card. You lose 2 life.
 mana={B}
 type=Sorcery
diff --git a/projects/mtg/include/MTGDefinitions.h b/projects/mtg/include/MTGDefinitions.h
index 98224a8e0..b72b67f08 100644
--- a/projects/mtg/include/MTGDefinitions.h
+++ b/projects/mtg/include/MTGDefinitions.h
@@ -254,7 +254,8 @@ class Constants
       DETHRONE = 132,
       OVERLOAD = 133,
       SHACKLER = 134,
-      NB_BASIC_ABILITIES = 135,
+      FLYERSONLY = 135,//can attack only if it has flying
+      NB_BASIC_ABILITIES = 136,
 
     RARITY_S = 'S',   //Special Rarity
     RARITY_M = 'M',   //Mythics
diff --git a/projects/mtg/src/MTGAbility.cpp b/projects/mtg/src/MTGAbility.cpp
index cdbfc47b0..f354162a1 100644
--- a/projects/mtg/src/MTGAbility.cpp
+++ b/projects/mtg/src/MTGAbility.cpp
@@ -3982,6 +3982,8 @@ int AbilityFactory::abilityEfficiency(MTGAbility * a, Player * p, int mode, Targ
     badAbilities[(int)Constants::WEAK] = true;
     badAbilities[(int)Constants::NOLIFEGAIN] = true;
     badAbilities[(int)Constants::NOLIFEGAINOPPONENT] = true;
+    badAbilities[(int)Constants::MUSTBLOCK] = true;
+    badAbilities[(int)Constants::FLYERSONLY] = true;
 
     if (AInstantBasicAbilityModifierUntilEOT * abi = dynamic_cast<AInstantBasicAbilityModifierUntilEOT *>(a))
     {
diff --git a/projects/mtg/src/MTGCardInstance.cpp b/projects/mtg/src/MTGCardInstance.cpp
index 432f8e965..de9b36f6f 100644
--- a/projects/mtg/src/MTGCardInstance.cpp
+++ b/projects/mtg/src/MTGCardInstance.cpp
@@ -637,6 +637,8 @@ int MTGCardInstance::canAttack()
 {
     if (basicAbilities[(int)Constants::CANTATTACK])
         return 0;
+    if (basicAbilities[(int)Constants::FLYERSONLY] && !basicAbilities[(int)Constants::FLYING])
+        return 0;
     if (tapped)
         return 0;
     if (hasSummoningSickness())
diff --git a/projects/mtg/src/MTGDefinitions.cpp b/projects/mtg/src/MTGDefinitions.cpp
index 16aa9eebf..5d40a9513 100644
--- a/projects/mtg/src/MTGDefinitions.cpp
+++ b/projects/mtg/src/MTGDefinitions.cpp
@@ -165,7 +165,8 @@ const char* Constants::MTGBasicAbilities[] = {
     "mustblock",
     "dethrone",
     "overload",
-    "shackler"
+    "shackler",
+    "flyersonly"
 };
 
 map<string,int> Constants::MTGBasicAbilitiesMap;