Fear of Sleep Paralysis {5}{U}
Enchantment Creature — Nightmare
Flying
Eerie — Whenever this creature or another enchantment you control enters and whenever you fully unlock a Room, tap up to one target creature and put a stun counter on it.
Stun counters can't be removed from permanents your opponents control. (They won't untap if they have stun counters.)
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Cards that do something similar expected a card that isn't here?
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Merchant Raiders 86%
$0.27#6833
"Whenever this creature or another Pirate you control enters, tap up to one target creature. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Storm of Forms 82%
$0.25#15653
"When you cast this spell, copy it for each kind of counter among permanents you control. You may choose new targets for the copies."
Ripples of Potential 81%
$2.77#972
"Proliferate, then choose any number of permanents you control that had a counter put on them this way. Those permanents phase out."