Permeating Mass 
Creature — Spirit
$0.31 #18154 0.06 10.1 years
Whenever this creature deals combat damage to a creature, that creature becomes a copy of this creature.
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Cards similar to Permeating Mass expected a card that isn't here?
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Cryptoplasm87%
$0.63↑#12679↑0.0715.6 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Cemetery Puca82%
$2.77↑#196020.25↑18.3 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."
Cephalid Facetaker76%
$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.""
Irma, Part-Time Mutant76%
$4.61↑#3753↑0.000.5 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."
Artisan of Forms75%
$0.23↓#167950.36↑12.9 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."
Blade of Shared Souls74%
$0.25↓#12177↑0.33↑3.6 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."
Kimahri, Valiant Guardian74%
$0.25↓#7041↑0.28↑1.2 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."
Deepfathom Echo73%
$0.33↑#9712↑0.122.8 years↓
"At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn."
Essence of the Wild73%
$0.49↑#24787↓0.1214.9 years↑
"Creatures you control enter as a copy of this creature."
Progenitor Mimic72%
$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.""
Assimilation Aegis72%
$0.42↑#9834↑0.38↑2.4 years↓
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, that creature becomes a copy of a creature card exiled with this Equipment."
Mirror of the Forebears72%
$1.63↑#10360↑0.53↑9.0 years↓
": Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
: Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
Shameless Charlatan71%
$0.22↓#204560.36↑4.2 years↓
"Commander creatures you own have "
: This creature becomes a copy of another target creature.""
: This creature becomes a copy of another target creature.""
Mirrorweave71%
$1.25↑#13782↑0.23↑18.3 years↑
"Each other creature becomes a copy of target nonlegendary creature until end of turn."
Splitting Slime70%
$0.84↑#155290.39↑10.0 years
"When this creature becomes monstrous, create a token that's a copy of this creature."
Protean Thaumaturge70%
$0.35↑#10264↑0.38↑6.6 years↓
"Whenever an enchantment you control enters, you may have this creature become a copy of another target creature, except it has this ability."
Taskmaster, Mercenary Mimic70%
$0.68↑#9620↑0.000.2 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."