Printlifter Ooze 

Creature — Ooze
$0.31 #8342 0.29 2.6 years
Deathtouch
Whenever this creature or another creature you control is turned face up, create a 0/0 green Ooze creature token with trample. The token enters with X +1/+1 counters on it, where X is the number of other creatures you control.
Disguise 

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Cards similar to Printlifter Ooze expected a card that isn't here?
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Salt Road Ambushers81%
$0.10↓#11980↓0.75↑11.4 years↑
"Whenever another permanent you control is turned face up, if it's a creature, put two +1/+1 counters on it."
Sumala Sentry81%
$0.11↓#23164↓0.50↑2.6 years
"Whenever a face-down permanent you control is turned face up, put a +1/+1 counter on it and a +1/+1 counter on this creature."
Experiment Twelve81%
$0.32↑#79170.07↓2.6 years
"Whenever this creature or another creature you control is turned face up, put +1/+1 counters on that creature equal to its power."
+1 more matching line
Pyrotechnic Performer80%
$0.23↓#11787↓0.12↓2.6 years
"Disguise
You may cast this card face down for
as a 2/2 creature with ward
. Turn it face up any time for its disguise cost."
Warbreak Trumpeter78%
$0.24↓#22152↓0.00↓23.6 years↑
"When this creature is turned face up, create X 1/1 red Goblin creature tokens."
Guardian Shield-Bearer77%
$0.14↓#26840↓0.60↑11.4 years↑
"When this creature is turned face up, put a +1/+1 counter on another target creature you control."
True Identity77%
$0.17↓#17091↓0.00↓2.6 years
"Disguise
You may cast this card face down for
as a 2/2 creature with ward
. Turn it face up any time for its disguise cost."
Growing Dread76%
$0.19↓#10758↓0.11↓1.9 years
"Whenever you turn a permanent face up, put a +1/+1 counter on it."
Pine Walker76%
$0.20↓#24042↓0.2811.9 years↑
"Whenever this creature or another creature you control is turned face up, untap that creature."
Aven Farseer76%
$0.08↓#29780↓0.3123.3 years↑
"Whenever a permanent is turned face up, put a +1/+1 counter on this creature."
Master of Pearls74%
$0.13↓#20080↓0.2411.9 years↑
"When this creature is turned face up, creatures you control get +2/+2 until end of turn."
Dog Walker73%
$0.24↓#22933↓0.56↑2.6 years
"Disguise 
You may cast this card face down for
as a 2/2 creature with ward
. Turn it face up any time for its disguise cost."
+1 more matching line