Renegade Doppelganger {1}{U}
Creature — Shapeshifter
Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn. (If it does, it loses this ability for the rest of the turn.)
click a line to search just that ability, click more to combine them
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.
Unstable Shapeshifter 89%
$0.90#25325
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
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.""
Eldrazi Mimic 87%
$2.39#10392
"Whenever another colorless creature you control enters, you may change this creature's base power and toughness to that creature's power and toughness until end of turn."
Social Snub 85%
$0.16#20937
"When you cast this spell while you control a creature, you may copy this spell."
Visage Bandit 84%
$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 84%
$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."
Devilish Valet 84%
$0.36#3312
"Whenever another creature you control enters, double this creature's power until end of turn."
Preston, the Vanisher 84%
$33.07#3792
"Whenever another nontoken creature you control enters, if it wasn't cast, create a token that's a copy of that creature, except it's a 0/1 white Illusion."
Vesuvan Doppelganger 84%
#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.""
Body Double 84%
$0.31#6056
"You may have this creature enter as a copy of any creature card in a graveyard."
Progenitor Mimic 83%
$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.""
Dual Nature 83%
$2.58#18998
"Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature."
Aboleth Spawn 83%
$8.51#3851
"Whenever a creature entering under an opponent's control causes a triggered ability of that creature to trigger, you may copy that ability. You may choose new targets for the copy."
Undercover Operative 82%
$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."
Hulking Metamorph 82%
$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."
Twilight Diviner 82%
$1.99#3533
"Whenever one or more other creatures you control enter, if they entered or were cast from a graveyard, create a token that's a copy of one of them. This ability triggers only once each turn."
Molten Echoes 82%
$10.14#2348
"Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step."
Volo, Guide to Monsters 82%
$0.39#8506
"Whenever you cast a creature spell that doesn't share a creature type with a creature you control or a creature card in your graveyard, copy that spell."