Add Support for Vedlaken Shackles and the likes

the alias 50120 is there to prevent untap  during untap phase and the
canuntap restriction will trigger if it's possible to untap ie tha card
doesn't have doesnotuntap,, or frozen or is tapped.

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

@@ -45725,6 +45725,15 @@ type=Legendary Artifact
 subtype=Equipment
 [/card]
 [card]
+name=Helm of Possession
+alias=50120
+auto={2}{T}{S(creature|mybattlefield)}:shackle target(creature)
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Helm of Possession during your untap step. -- {2}, {T}, Sacrifice a creature: Gain control of target creature for as long as you control Helm of Possession and Helm of Possession remains tapped.
+mana={4}
+type=Artifact
+[/card]
+[card]
 name=Helm of the Ghastlord
 target=creature
 auto=teach(creature[blue]) 1/1
@@ -46428,6 +46437,18 @@ mana={2}
 type=Artifact
 [/card]
 [card]
+name=Hivis of the Scale
+alias=50120
+auto={T}:shackle target(dragon)
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Hivis of the Scale during your untap step. -- {T}: Gain control of target Dragon for as long as you control Hivis and Hivis remains tapped.
+mana={3}{R}{R}
+type=Legendary Creature
+subtype=Viashino Shaman
+power=3
+toughness=4
+[/card]
+[card]
 name=Hoar Shade
 auto={B}:1/1
 text={B}: Hoar Shade gets +1/+1 until end of turn.
@@ -69577,6 +69598,18 @@ power=3
 toughness=6
 [/card]
 [card]
+name=Old Man of the Sea
+alias=50120
+auto={T}:shackle target(creature[power<=storedpower])
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Old Man of the Sea during your untap step. -- {T}: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.
+mana={1}{U}{U}
+type=Creature
+subtype=Djinn
+power=2
+toughness=3
+[/card]
+[card]
 name=Olivia Voldaren
 abilities=flying
 auto={1}{R}:all(this) counter(1/1,1) && target(other creature) damage:1 && transforms((vampire)) forever
@@ -82544,6 +82577,18 @@ power=*
 toughness=*
 [/card]
 [card]
+name=Rubinia Soulsinger
+alias=50120
+auto={T}:shackle target(creature)
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Rubinia Soulsinger during your untap step. -- {T}: Gain control of target creature for as long as you control Rubinia and Rubinia remains tapped.
+mana={2}{G}{W}{U}
+type=Legendary Creature
+subtype=Faerie
+power=2
+toughness=3
+[/card]
+[card]
 name=Ruby Leech
 abilities=first strike
 auto=lord(*[red]|myhand,mylibrary,mygraveyard,myexile) altercost(red,+1)
@@ -108764,6 +108809,15 @@ power=2
 toughness=2
 [/card]
 [card]
+name=Vedalken Shackles
+alias=50120
+auto={2}{T}:shackle target(creature[power<=type:island:mybattlefield])
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Vedalken Shackles during your untap step. -- {2}, {T}: Gain control of target creature with power less than or equal to the number of Islands you control for as long as Vedalken Shackles remains tapped.
+mana={3}
+type=Artifact
+[/card]
+[card]
 name=Veil of Birds
 auto=@movedto(*|opponentstack) once:transforms((removetypes)) forever && transforms((Bird Creature,setpower=1,settoughness=1,flying)) forever
 text=When an opponent casts a spell, if Veil of Birds is an enchantment, Veil of Birds becomes a 1/1 Bird creature with flying.
@@ -114269,6 +114323,18 @@ power=2
 toughness=2
 [/card]
 [card]
+name=Willow Satyr
+alias=50120
+auto={T}:shackle target(creature[legendary])
+auto=@each my untap restriction{canuntap}:may untap
+text=You may choose not to untap Willow Satyr during your untap step. -- {T}: Gain control of target legendary creature for as long as you control Willow Satyr and Willow Satyr remains tapped.
+mana={2}{G}{G}
+type=Creature
+subtype=Satyr
+power=1
+toughness=1
+[/card]
+[card]
 name=Wilt-Leaf Cavaliers
 abilities=vigilance
 text=Vigilance