Tilonalli's Skinshifter 
Creature — Human Shaman
$0.21 #23689 0.17 9.1 years
Haste
Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn.
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Cards similar to Tilonalli's Skinshifter expected a card that isn't here?
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Cryptoplasm86%
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"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Cytoshape84%
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"Choose a nonlegendary creature on the battlefield. Target creature becomes a copy of that creature until end of turn."
Sunfrill Imitator82%
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"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Mirrorweave82%
$1.18↑#13954↑0.40↑18.5 years↑
"Each other creature becomes a copy of target nonlegendary creature until end of turn."
Barging Sergeant82%
$0.15↓#240880.128.0 years↓
"Haste"
Razorkin Hordecaller82%
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"Haste"
Nascent Metamorph81%
$0.29↑#17638↑0.146.5 years↓
"Whenever this creature attacks or blocks, target opponent reveals cards from the top of their library until they reveal a creature card. This creature becomes a copy of that card until end of turn. Then that player puts all cards revealed this way on the bottom of their library in a random order."
Rubblebelt Rioters80%
$0.24↑#18384↑0.137.5 years↓
"Haste"
Amy Rose79%
$1.41↑#7923↑0.38↑1.3 years↓
"Haste"
Permeating Mass78%
$0.34↑#18412↑0.2510.2 years↑
"Whenever this creature deals combat damage to a creature, that creature becomes a copy of this creature."
Identity Thief78%
$0.18↓#10235↑0.44↑10.2 years↑
"Whenever this creature attacks, you may exile another target nontoken creature. If you do, this creature becomes a copy of that creature until end of turn. Return the exiled card to the battlefield under its owner's control at the beginning of the next end step."
Cemetery Puca78%
$2.76↑#199360.07↓18.5 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."
Artisan of Forms78%
$0.20↓#17065↑0.05↓13.1 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."
The Jolly Balloon Man78%
$0.52↑#2533↑0.33↑2.1 years↓
"Haste"
Stampede Surfer78%
$0.39↑#193130.112.7 years↓
"Haste"
Irma, Part-Time Mutant77%
$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."
Tajic, Legion's Edge77%
$0.29↑#8052↑0.218.0 years↓
"Haste"
Taskmaster, Mercenary Mimic76%
$0.67↑#8457↑0.35↑0.3 years↓
"At the beginning of your first main phase, until your next turn, this card becomes a copy of up to one target creature on the battlefield or creature card in a graveyard, except his name is this card and he's a legendary Human Mercenary Villain creature."
Blade of Shared Souls76%
$0.25↑#12362↑0.06↓3.7 years↓
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, you may have that creature become a copy of another target creature you control."
Cephalid Facetaker76%
$4.08↑#6963↑0.224.5 years↓
"At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked.""