Mesmeric Fiend 

Creature — Nightmare Horror
$0.73 #20655 0.25 24.7 years
When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When this creature leaves the battlefield, return the exiled card to its owner's hand.
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Cards similar to Mesmeric Fiend 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.
Tidehollow Sculler100%
$0.14↓#225680.06↓18.0 years↓
"When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card."
+1 more matching line
Wormfang Behemoth96%
$0.23↓#30468↓0.1724.4 years
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."
+1 more matching line
Hypnox92%
$1.92↑#217400.74↑24.7 years
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."
+1 more matching line
Thought-Knot Seer91%
$5.16↑#9099↑0.45↑10.7 years↓
"When this creature enters, target opponent reveals their hand. You choose a nonland card from it and exile that card."
+1 more matching line
Brain Maggot91%
$0.28↓#16288↑0.2412.8 years↓
"When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card until this creature leaves the battlefield."
Kitesail Freebooter90%
$0.26↓#13611↑0.39↑9.1 years↓
"When this creature enters, target opponent reveals their hand. You choose a noncreature, nonland card from it. Exile that card until this creature leaves the battlefield."
Deep-Cavern Bat88%
$0.34↓#8089↑0.53↑2.9 years↓
"When this creature enters, look at target opponent's hand. You may exile a nonland card from it until this creature leaves the battlefield."
Severance Priest86%
$0.11↓#244080.211.5 years↓
"When this creature enters, target opponent reveals their hand. You may choose a nonland card from it. If you do, exile that card."
+1 more matching line
Parallax Nexus86%
$0.73#29141↓0.3126.7 years↑
"When this enchantment leaves the battlefield, each player returns to their hand all cards they own exiled with it."
+1 more matching line
Fear of Abduction86%
$0.14↓#189030.162.1 years↓
"When this creature leaves the battlefield, put each card exiled with it into its owner's hand."
+1 more matching line
Journey to Nowhere84%
$0.20↓#8858↑0.05↓17.0 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Faceless Butcher84%
$0.19↓#171840.07↓24.7 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Fiend Hunter84%
$0.07↓#3912↑0.2615.1 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Cloak and Dagger, Entwined82%
$0.27↓#195490.340.3 years↓
"When this card enter, choose target opponent and up to one target creature they control. They reveal their hand. You may exile a nonland card from their hand or the chosen creature until this card leave the battlefield."
Petravark82%
$0.19↓#28450↓0.3324.7 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Leonin Relic-Warder81%
$0.22↓#7226↑0.13↓15.7 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Castigate80%
$0.19↓#247480.3520.8 years↓
"Target opponent reveals their hand. You choose a nonland card from it and exile that card."
Thought Prison80%
$0.20↓#238080.56↑23.0 years↓
"When this artifact enters, you may have target player reveal their hand. If you do, choose a nonland card from it and exile that card."
Night Terrors80%
$0.05↓#27323↓0.2815.1 years↓
"Target player reveals their hand. You choose a nonland card from it. Exile that card."