Permeating Mass 
Creature — Spirit
$0.34 #18412 0.25 10.2 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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Cryptoplasm86%
$0.64↑#12938↑0.44↑15.7 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 Puca81%
$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."
Tilonalli's Skinshifter78%
$0.21↓#23689↓0.179.1 years↓
"Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn."
Protean Thaumaturge78%
$0.31↓#10641↑0.00↓6.7 years↓
"Whenever an enchantment you control enters, you may have this creature become a copy of another target creature, except it has this ability."
Renegade Doppelganger76%
$0.55↑#193200.11↓16.5 years↑
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
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.""
Irma, Part-Time Mutant75%
$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."
Silent Hallcreeper74%
$1.19↑#1442↑0.272.1 years↓
"• This creature becomes a copy of another target creature you control."
Artisan of Forms74%
$0.20↓#170650.05↓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."
Unstable Shapeshifter74%
$1.16↑#25825↓0.1829.0 years↑
"Whenever another creature enters, this creature becomes a copy of that creature, except it has this ability."
Blade of Shared Souls74%
$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."
Kimahri, Valiant Guardian73%
$0.21↓#6902↑0.00↓1.4 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 Echo72%
$0.26↓#9953↑0.12↓2.9 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."
Progenitor Mimic72%
$1.06↑#5506↑0.2713.5 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.""
Essence of the Wild72%
$0.47↑#25035↓0.14↓15.1 years↑
"Creatures you control enter as a copy of this creature."
Infinite Reflection71%
$0.24↓#177840.12↓14.5 years↑
"When this Aura enters attached to a creature, each other nontoken creature you control becomes a copy of that creature."
Assimilation Aegis71%
$0.47↑#9899↑0.182.5 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 Forebears71%
$1.81↑#10612↑0.12↓9.2 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 Charlatan70%
$0.24↓#209000.06↓4.4 years↓
"Commander creatures you own have "
: This creature becomes a copy of another target creature.""
: This creature becomes a copy of another target creature.""
Mirrorweave70%
$1.18↑#13954↑0.40↑18.5 years↑
"Each other creature becomes a copy of target nonlegendary creature until end of turn."