Hulking Metamorph {9}
Artifact Creature — Shapeshifter
Prototype {2}{U}{U} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
You may have this creature enter as a copy of an artifact or creature you control, except it's an artifact creature in addition to its other types, and its power and toughness are equal to this creature's power and toughness.
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Cards that do something similar expected a card that isn't here?
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Phyrexian Metamorph 98%
$2.32#306
"You may have this creature enter as a copy of any artifact or creature on the battlefield, except it's an artifact in addition to its other types."
Waxen Shapethief 95%
$0.38#6388
"You may have this creature enter as a copy of an artifact or creature you control."
Auton Soldier 90%
$10.83#2016
"You may have this creature enter as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad."
Body Double 89%
$0.31#6056
"You may have this creature enter as a copy of any creature card in a graveyard."
Mocking Doppelganger 89%
$4.33#5325
"You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded.""
Activated Sleeper 88%
$1.54#8499
"You may have this creature enter as a copy of any creature card in a graveyard that was put there from the battlefield this turn, except it's a Phyrexian in addition to its other types."
Sakashima's Protege 88%
$0.45#5882
"You may have this creature enter as a copy of any permanent that entered this turn."
Synth Infiltrator 88%
$0.25#8793
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types."
Undercover Operative 88%
$0.37#5367
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature."
Progenitor Mimic 88%
$1.38#5243
"You may have this creature enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature.""
Jwari Shapeshifter 88%
$3.79#10849
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Vizier of Many Faces 87%
$0.30#4322
"You may have this creature enter as a copy of any creature on the battlefield, except if this creature was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types."
+1 more matching line
Pirated Copy 87%
$7.51#8155
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Pirate in addition to its other types and it has "Whenever this creature or another creature with the same name deals combat damage to a player, you draw a card.""
Stunt Double 87%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
Naga Fleshcrafter 87%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 87%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Vesuvan Doppelganger 87%
#16958
"You may have this creature enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability.""