Cards like Sumala Sentry

Salt Road Ambushers97%

$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."

turn-face-up-trigger, gives-pp-counters, repeatable-pp-counters

Aven Farseer96%

$0.08↓#29780↓0.31↓23.3 years↑

"Whenever a permanent is turned face up, put a +1/+1 counter on this creature."

turn-face-up-trigger, repeatable-pp-counters, gains-pp-counters

Growing Dread96%

$0.19↑#10758↑0.11↓1.9 years

"Whenever you turn a permanent face up, put a +1/+1 counter on it."

turn-face-up-trigger, gives-pp-counters, repeatable-pp-counters

Experiment Twelve88%

$0.32↑#7917↑0.07↓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."

turn-face-up-trigger, gives-pp-counters, repeatable-pp-counters

Cryptid Inspector88%

$0.12↑#17216↑0.11↓1.9 years

"Whenever a face-down permanent you control enters and whenever this creature or another permanent you control is turned face up, put a +1/+1 counter on this creature."

turn-face-up-trigger, repeatable-pp-counters, gains-pp-counters

Hungry Megasloth84%

$0.18↑#264620.12↓1.8 years

"Reach"

repeatable-pp-counters, gains-pp-counters

Printlifter Ooze81%

$0.31↑#8342↑0.29↓2.6 years

"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."

turn-face-up-trigger, gives-pp-counters, repeatable-pp-counters

Mastery of the Unseen80%

$0.14↑#16472↑0.28↓11.6 years↑

"Whenever a permanent you control is turned face up, you gain 1 life for each creature you control."

turn-face-up-trigger, face-up-face-down-effects, triggered-ability

Treetop Snarespinner80%

$0.21↑#8484↑0.19↓1.8 years

"Reach"

gives-pp-counters, repeatable-pp-counters

Sandsteppe Mastodon80%

$0.13↑#214670.00↓11.6 years↑

"Reach"

gives-pp-counters, triggered-ability

Trail of Mystery79%

$0.10↓#5739↑0.18↓11.9 years↑

"Whenever a permanent you control is turned face up, if it's a creature, it gets +2/+2 until end of turn."

turn-face-up-trigger, face-up-face-down-effects, triggered-ability

Rosa, Resolute White Mage78%

$3.00↑#6146↑0.19↓1.2 years↓

"Reach"

gives-pp-counters, repeatable-pp-counters, triggered-ability

Panoptic Projektor76%

$0.30↑#9031↑0.62↑2.6 years

"If turning a face-down permanent face up causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."

turn-face-up-trigger, face-up-face-down-effects, triggered-ability