Printlifter Ooze 

Creature — Ooze
$0.38 #8687 0.13 2.7 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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Salt Road Ambushers80%
$0.10↓#12468↓0.00↓11.6 years↑
"Whenever another permanent you control is turned face up, if it's a creature, put two +1/+1 counters on it."
Experiment Twelve80%
$0.33↓#82930.00↓2.7 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
Sumala Sentry78%
$0.09↓#23669↓0.122.7 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."
Pyrotechnic Performer78%
$0.23↓#12180↓0.062.7 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 Trumpeter76%
$0.25↓#22499↓0.00↓23.7 years↑
"When this creature is turned face up, create X 1/1 red Goblin creature tokens."
Crowd-Control Warden76%
$0.07↓#22337↓0.00↓2.7 years
"As this creature enters or is turned face up, put X +1/+1 counters on it, where X is the number of other creatures you control."
+1 more matching line
Guardian Shield-Bearer76%
$0.10↓#27183↓0.00↓11.6 years↑
"When this creature is turned face up, put a +1/+1 counter on another target creature you control."
Pine Walker75%
$0.26↓#24433↓0.0612.1 years↑
"Whenever this creature or another creature you control is turned face up, untap that creature."
True Identity74%
$0.19↓#17625↓0.062.7 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 Dread74%
$0.21↓#11469↓0.222.1 years
"Whenever you turn a permanent face up, put a +1/+1 counter on it."
Aven Farseer73%
$0.08↓#29968↓0.00↓23.4 years↑
"Whenever a permanent is turned face up, put a +1/+1 counter on this creature."
Master of Pearls73%
$0.15↓#20637↓0.29↑12.1 years↑
"When this creature is turned face up, creatures you control get +2/+2 until end of turn."
Dog Walker72%
$0.12↓#23306↓0.24↑2.7 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