Hulking Metamorph 
Artifact Creature — Shapeshifter
$0.21 #8223 0.13 3.9 years
Prototype 
— 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
— 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 similar to Hulking Metamorph expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Waxen Shapethief90%
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"You may have this creature enter as a copy of an artifact or creature you control."
Quicksilver Gargantuan88%
$0.51↑#18556↓0.43↑16.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Gigantoplasm88%
$0.62↑#90490.39↑10.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "
: This creature has base power and toughness X/X.""
: This creature has base power and toughness X/X.""
Sculpting Steel88%
$1.68↑#667↑0.32↑23.0 years↑
"You may have this artifact enter as a copy of any artifact on the battlefield."
Mirror Image86%
$0.30↑#5189↑0.068.3 years↑
"You may have this creature enter as a copy of a creature you control."
Clone85%
$0.30↑#3704↑0.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double85%
$4.21↑#3814↑0.38↑10.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Glasspool Mimic // Glasspool Shore84%
$6.55↑#1165↑0.27↑6.1 years↑
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Copy Artifact82%
$64.25↑#4124↑0.74↑33.2 years↑
"You may have this enchantment enter as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types."
Phyrexian Metamorph80%
$2.20↑#314↑0.44↑15.4 years↑
"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."
Visage Bandit80%
$0.17↓#73900.152.5 years↓
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
+1 more matching line
Synth Infiltrator78%
$0.29↑#90350.062.6 years↓
"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."
Malleable Impostor78%
$5.86↑#4600↑0.113.1 years
"You may have this creature enter as a copy of a creature an opponent controls, except it's a Faerie Shapeshifter in addition to its other types and it has flying."
Mirrormade77%
$2.56↑#1160↑0.38↑7.0 years↑
"You may have this enchantment enter as a copy of any artifact or enchantment on the battlefield."
Vesuvan Doppelganger76%
$18.14↑#17549↓0.28↑33.2 years↑
"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.""
Progenitor Mimic76%
$1.06↑#5506↑0.27↑13.5 years↑
"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.""
Blitz Automaton76%
$0.15↓#19589↓0.00↓3.9 years
"Prototype 
— 3/2"
— 3/2"
Rust Goliath76%
$0.13↓#15520↓0.00↓3.9 years
"Prototype 
— 3/5"
— 3/5"
Chameleon, Master of Disguise76%
$0.39↑#1718↑0.38↑1.1 years↓
"You may have this card enter as a copy of a creature you control, except his name is this card."
Sakashima's Student76%
$17.70↑#3716↑0.45↑14.4 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types."