Irma, Part-Time Mutant 

Legendary Creature — Human Mutant Shapeshifter
$4.61 #3753 0.00 0.5 years
At the beginning of combat on your turn, Irma becomes a copy of up to one other target creature you control, except her name is Irma, Part-Time Mutant and she has this ability. Then put a +1/+1 counter on her.
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Gogo, Mysterious Mime85%
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"At the beginning of combat on your turn, you may have this card become a copy of another target creature you control until end of turn, except its name is this card. If you do, this card and that creature each get +2/+0 and gain haste until end of turn and attack this turn if able."
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"
,
: Choose target creature you control. Each creature you control other than the chosen creature becomes a copy of that creature until end of turn, except it isn't legendary. Activate only as a sorcery."
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"Whenever a creature card is put into an opponent's graveyard from anywhere, you may have this card become a copy of that card, except its name is this card, it's legendary in addition to its other types, and it has hexproof and this ability."
Cemetery Puca79%
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"Whenever a creature dies, you may pay
. If you do, this creature becomes a copy of that creature, except it has this ability."
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"Choose target creature you control. Each other creature becomes a copy of that creature until end of turn, except it isn't legendary."
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"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."
Cephalid Facetaker78%
$5.46↑#6836↓0.33↑4.4 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.""
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"
: this card becomes a copy of target creature card in your graveyard with mana value X, except its name is this card, it's legendary in addition to its other types, and it has this ability."
Impossible Man78%
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"
: this card becomes a copy of another target permanent until end of turn, except his name is this card."
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