Sakashima's Protege {4}{U}{U}
Creature — Shapeshifter
Flash
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
You may have this creature enter as a copy of any permanent that entered this turn.
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Cards that do something similar 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.
Body Double 91%
$0.31#6056
"You may have this creature enter as a copy of any creature card in a graveyard."
Clever Impersonator 90%
$4.84#1275
"You may have this creature enter as a copy of any nonland permanent on the battlefield."
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."
Mocking Doppelganger 88%
$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.""
+1 more matching line
Hulking Metamorph 88%
$0.18#7907
"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."
Waxen Shapethief 87%
$0.38#6388
"You may have this creature enter as a copy of an artifact or creature you control."
+1 more matching line
Visage Bandit 87%
$0.22#7472
"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."
Glasspool Mimic // Glasspool Shore 87%
$6.45#1180
"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."
Phyrexian Metamorph 87%
$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."
Spark Double 86%
$14.28#401
"You may have this creature enter as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary."
Undercover Operative 85%
$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."
Stunt Double 84%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
+1 more matching line
Naga Fleshcrafter 84%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 84%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Omni-Changeling 84%
$0.31#6806
"You may have this creature enter as a copy of any creature on the battlefield, except it has changeling."
Vizier of Many Faces 84%
$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."
Auton Soldier 84%
$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."
Malleable Impostor 84%
$8.10#4411
"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."