Mesmeric Fiend 
Creature — Nightmare Horror
$0.77 #20343 0.33 24.6 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%
$0.13↓#221330.4017.9 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↓#30122↓0.00↓24.3 years
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."
+1 more matching line
Hypnox92%
$1.98↑#214340.87↑24.6 years
"When this creature leaves the battlefield, return the exiled cards to their owner's hand."
+1 more matching line
Thought-Knot Seer91%
$5.03↑#9049↑0.94↑10.6 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%
$0.30↓#15868↑0.3012.7 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%
$0.28↓#13385↑0.15↓8.9 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%
$0.38↓#8080↑0.21↓2.8 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."
Fear of Abduction87%
$0.17↓#183370.13↓1.9 years↓
"When this creature leaves the battlefield, put each card exiled with it into its owner's hand."
+1 more matching line
Severance Priest86%
$0.08↓#240710.291.4 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%
$0.70↓#28787↓0.56↑26.6 years↑
"When this enchantment leaves the battlefield, each player returns to their hand all cards they own exiled with it."
+1 more matching line
Journey to Nowhere84%
$0.19↓#8682↑0.00↓16.9 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Faceless Butcher84%
$0.17↓#169630.2424.6 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Fiend Hunter84%
$0.09↓#3915↑0.20↓14.9 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Cloak and Dagger, Entwined82%
$0.30↓#206970.00↓0.2 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%
$0.20↓#28153↓0.44↑24.6 years
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Leonin Relic-Warder81%
$0.21↓#7039↑0.17↓15.6 years↓
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Castigate80%
$0.19↓#24483↓0.20↓20.7 years↓
"Target opponent reveals their hand. You choose a nonland card from it and exile that card."
Thought Prison80%
$0.21↓#234210.93↑22.9 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%
$0.11↓#26897↓0.3214.9 years↓
"Target player reveals their hand. You choose a nonland card from it. Exile that card."
Oblivion Ring80%
$0.18↓#4982↑0.3318.9 years↓
"When this enchantment leaves the battlefield, return the exiled card to the battlefield under its owner's control."
+1 more matching line