Fear of Sleep Paralysis 
Enchantment Creature — Nightmare
$0.40 #3686 0.71 2.1 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%
$0.14↓#20182↓0.07↓3.1 years↑
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Captivating Unicorn83%
$0.17↓#18292↓0.18↓6.7 years↑
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Optimistic Scavenger80%
$0.26↓#9549↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a +1/+1 counter on target creature."
Floodpits Drowner79%
$0.45↑#8191↓0.18↓2.1 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Erratic Apparition76%
$0.14↓#22483↓0.06↓2.1 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%
$0.41↑#7078↓0.45↓0.5 years↓
"Whenever an enchantment you control enters, tap up to one target creature and goad it."
Utrom Scientists73%
$0.06↓#21901↓0.31↓0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Grappling Kraken72%
$0.26↓#5452↓0.43↓1.9 years
"Whenever a land you control enters, tap target creature an opponent controls and put a stun counter on it."
Unwilling Vessel72%
$0.17↓#17234↓0.00↓2.1 years
"Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature."
Rowdy Snowballers72%
$0.10↓#13824↓0.17↓0.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Alchemax Slayer-Bots72%
$0.19↓#18034↓0.43↓1.1 years
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol72%
$0.21↓#29666↓0.16↓0.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fractal Mascot72%
$0.09↓#22254↓0.09↓0.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Gremlin Tamer72%
$0.22↓#8787↓0.00↓2.1 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%
$0.13↓#17654↓0.25↓2.1 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%
$0.10↓#25206↓0.00↓2.1 years
"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%
$0.22↓#28589↓0.30↓0.6 years↓
"When this Aura enters, tap enchanted creature."
Charmed Sleep72%
$0.09↓#15858↓0.30↓7.0 years↑
"When this Aura enters, tap enchanted creature."
Waterknot72%
$0.13↓#22211↓0.21↓8.8 years↑
"When this Aura enters, tap enchanted creature."
Starlight Snare72%
$0.13↓#20533↓0.93↑1.9 years
"When this Aura enters, tap enchanted creature."