Renegade Doppelganger 
Creature — Shapeshifter
$0.55 #19320 0.11 16.5 years
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.)
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Cards similar to Renegade Doppelganger expected a card that isn't here?
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Unstable Shapeshifter96%
$1.16↑#25825↓0.1829.0 years↑
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
Essence of the Wild92%
$0.47↓#25035↓0.1415.1 years↓
"Creatures you control enter as a copy of this creature."
Infinite Reflection89%
$0.24↓#177840.1214.5 years↓
"When this Aura enters attached to a creature, each other nontoken creature you control becomes a copy of that creature."
Mirror Image88%
$0.30↓#5189↑0.068.3 years↓
"You may have this creature enter as a copy of a creature you control."
Clone88%
$0.30↓#3704↑0.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double88%
$4.21↑#3814↑0.38↑10.1 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Cryptoplasm87%
$0.64↑#12938↑0.44↑15.7 years
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Vesuvan Doppelganger82%
$18.14↑#175490.28↑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.""
Protean Thaumaturge82%
$0.31↓#10641↑0.00↓6.7 years↓
"Whenever an enchantment you control enters, you may have this creature become a copy of another target creature, except it has this ability."
Quicksilver Gargantuan82%
$0.51↓#185560.43↑16.1 years
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Naga Fleshcrafter81%
$0.34↓#4876↑0.121.5 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Glasspool Mimic // Glasspool Shore81%
$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."
Progenitor Mimic80%
$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.""
Cemetery Puca80%
$2.76↑#199360.0718.5 years↑
"Whenever a creature dies, you may pay . If you do, this creature becomes a copy of that creature, except it has this ability."
. If you do, this creature becomes a copy of that creature, except it has this ability."
Gigantoplasm78%
$0.62↑#9049↑0.39↑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.""
Visage Bandit78%
$0.17↓#7390↑0.152.5 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."
Waxen Shapethief77%
$0.34↓#5868↑0.061.7 years↓
"You may have this creature enter as a copy of an artifact or creature you control."
Artisan of Forms77%
$0.20↓#170650.0513.1 years↓
"Whenever you cast a spell that targets this creature, you may have this creature become a copy of target creature, except it has this ability."
Malleable Impostor77%
$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."
Irma, Part-Time Mutant76%
$4.09↑#3406↑0.45↑0.6 years↓
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."