Fear of Sleep Paralysis 
Enchantment Creature — Nightmare
$0.40 #3423 0.52 1.9 years
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 similar to Fear of Sleep Paralysis expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Rimefur Reindeer83%
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"Whenever an enchantment you control enters, tap target creature an opponent controls."
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$0.17↓#18110↓0.25↓6.6 years↑
"Whenever an enchantment you control enters, tap target creature an opponent controls."
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$0.27↓#9242↓0.17↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature."
Floodpits Drowner79%
$0.41↑#8207↓0.35↓1.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Erratic Apparition76%
$0.12↓#21733↓0.07↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +1/+1 until end of turn."
Killian, Decisive Mentor74%
$0.40#7554↓0.00↓0.4 years↓
"Whenever an enchantment you control enters, tap up to one target creature and goad it."
Utrom Scientists73%
$0.13↓#22162↓0.00↓0.5 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Grappling Kraken72%
$0.29↓#5671↓0.26↓1.8 years
"Whenever a land you control enters, tap target creature an opponent controls and put a stun counter on it."
Unwilling Vessel72%
$0.17↓#16456↓0.04↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
Rowdy Snowballers72%
$0.17↓#13993↓0.00↓0.8 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol72%
$0.17↓#30233↓0.00↓0.2 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots72%
$0.22↓#18129↓0.17↓0.9 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot72%
$0.13↓#22595↓0.00↓0.4 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Gremlin Tamer72%
$0.29↓#8117↓0.15↓1.9 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 1/1 red Gremlin creature token."
Fear of Immobility72%
$0.11↓#17042↓0.18↓1.9 years
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Stalked Researcher72%
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"Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature can attack this turn as though it didn't have defender."
Containment Protocol72%
$0.21↓#28751↓0.00↓0.5 years↓
"When this Aura enters, tap enchanted creature."
Capture Sphere72%
$0.05↓#18702↓0.25↓7.9 years↑
"When this Aura enters, tap enchanted creature."
Waterknot72%
$0.12↓#21884↓0.25↓8.6 years↑
"When this Aura enters, tap enchanted creature."
Starlight Snare72%
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"When this Aura enters, tap enchanted creature."