Renegade Doppelganger 
Creature — Shapeshifter
$0.49 #19345 0.24 16.4 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 Shapeshifter95%
$1.00↑#25569↓0.53↑28.9 years↑
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
Mirror Image90%
$0.30↓#5382↑0.198.1 years↓
"You may have this creature enter as a copy of a creature you control."
Stunt Double90%
$4.07↑#3805↑0.2210.0 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Clone90%
$0.31↓#3742↑0.3133.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Infinite Reflection88%
$0.24↓#176190.3314.3 years↓
"When this Aura enters attached to a creature, each other nontoken creature you control becomes a copy of that creature."
Vesuvan Doppelganger86%
$18.79↑#172480.35↑33.1 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.""
Essence of the Wild86%
$0.49#24787↓0.12↓14.9 years↓
"Creatures you control enter as a copy of this creature."
Quicksilver Gargantuan86%
$0.54↑#182400.1415.9 years
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Progenitor Mimic85%
$1.11↑#5370↑0.43↑13.3 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.""
Glasspool Mimic // Glasspool Shore85%
$5.87↑#1166↑0.215.9 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."
Visage Bandit84%
$0.15↓#7365↑0.41↑2.4 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."
Gigantoplasm83%
$0.49#9188↑0.05↓10.8 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.""
Phantasmal Image82%
$4.89↑#1481↑0.3015.1 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it.""
Mirrorhall Mimic // Ghastly Mimicry82%
$2.02↑#4095↑0.174.8 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Spirit in addition to its other types."
Waxen Shapethief81%
$0.33↓#6103↑0.151.6 years↓
"You may have this creature enter as a copy of an artifact or creature you control."
Altered Ego80%
$0.20↓#4080↑0.13↓10.4 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it."
Protean Raider80%
$0.68↑#13446↑0.67↑8.6 years↓
"If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield."
Malleable Impostor80%
$5.78↑#4494↑0.163.0 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."
Mocking Doppelganger80%
$3.39↑#5455↑0.214.2 years↓
"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.""
Jwari Shapeshifter80%
$3.80↑#10806↑0.00↓16.6 years
"You may have this creature enter as a copy of any Ally creature on the battlefield."