Unstable Shapeshifter 
Creature — Shapeshifter
$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.
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Cards similar to Unstable Shapeshifter expected a card that isn't here?
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Renegade Doppelganger95%
$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."
Stunt Double86%
$4.07↑#3805↑0.22↓10.0 years↓
"You may have this creature enter as a copy of any creature on the battlefield."
Clone86%
$0.31↓#3742↑0.31↓33.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image86%
$0.30↓#5382↑0.19↓8.1 years↓
"You may have this creature enter as a copy of a creature you control."
Infinite Reflection84%
$0.24↓#17619↑0.33↓14.3 years↓
"When this Aura enters attached to a creature, each other nontoken creature you control becomes a copy of that creature."
Vesuvan Doppelganger81%
$18.79↑#17248↑0.35↓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.""
Progenitor Mimic80%
$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.""
Quicksilver Gargantuan80%
$0.54↓#18240↑0.14↓15.9 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Essence of the Wild80%
$0.49↓#247870.12↓14.9 years↓
"Creatures you control enter as a copy of this creature."
Glasspool Mimic // Glasspool Shore78%
$5.87↑#1166↑0.21↓5.9 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."
Malleable Impostor78%
$5.78↑#4494↑0.16↓3.0 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."
Gigantoplasm77%
$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.""
Mocking Doppelganger76%
$3.39↑#5455↑0.21↓4.2 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.""
Phantasmal Image76%
$4.89↑#1481↑0.30↓15.1 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.""
Jwari Shapeshifter76%
$3.80↑#10806↑0.00↓16.6 years↓
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Altered Ego75%
$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."
Visage Bandit75%
$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."
Mirrorhall Mimic // Ghastly Mimicry75%
$2.02↑#4095↑0.17↓4.8 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 Shapethief74%
$0.33↓#6103↑0.15↓1.6 years↓
"You may have this creature enter as a copy of an artifact or creature you control."
Protean Raider74%
$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."