Brain Maggot 
Enchantment Creature — Insect
$0.30 #15868 0.30 12.7 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.
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Cards similar to Brain Maggot 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.
Kitesail Freebooter97%
$0.28↓#133850.15↓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 Bat94%
$0.38↑#8080↑0.212.8 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."
Cloak and Dagger, Entwined92%
$0.30#20697↓0.00↓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."
Mesmeric Fiend91%
$0.77↑#20343↓0.3324.6 years↑
"When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card."
Tidehollow Sculler90%
$0.13↓#22133↓0.40↑17.9 years↑
"When this creature enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card."
Castigate82%
$0.19↓#24483↓0.2020.7 years↑
"Target opponent reveals their hand. You choose a nonland card from it and exile that card."
Night Terrors82%
$0.11↓#26897↓0.3214.9 years↑
"Target player reveals their hand. You choose a nonland card from it. Exile that card."
Dark Inquiry80%
$0.12↓#25043↓0.79↑8.6 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Pilfer80%
$0.16↓#8774↑0.11↓4.0 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Severance Priest80%
$0.08↓#24071↓0.291.4 years↓
"When this creature enters, target opponent reveals their hand. You may choose a nonland card from it. If you do, exile that card."
Doomfall80%
$0.19↓#21932↓0.63↑9.1 years↓
"• Target opponent reveals their hand. You choose a nonland card from it. Exile that card."
Hypnox80%
$1.98↑#21434↓0.87↑24.6 years↑
"When this creature enters, if you cast it from your hand, exile all cards from target opponent's hand."
Thought-Knot Seer78%
$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."
Intellect Devourer78%
$0.37↑#7421↑0.374.2 years↓
"When this creature enters, each opponent exiles a card from their hand until this creature leaves the battlefield."
Nightsnare78%
$0.08↓#26947↓0.3111.1 years↓
"Target opponent reveals their hand. You may choose a nonland card from it. If you do, that player discards that card. If you don't, that player discards two cards."
Thought-Stalker Warlock78%
$0.27↓#130940.19↓2.1 years↓
"When this creature enters, choose target opponent. If they lost life this turn, they reveal their hand, you choose a nonland card from it, and they discard that card. Otherwise, they discard a card."
Grief77%
$3.10↑#6454↑1.01↑5.3 years↓
"When this creature enters, target opponent reveals their hand. You choose a nonland card from it. That player discards that card."
Distress77%
$0.08↓#185131.00↑21.9 years↑
"Target player reveals their hand. You choose a nonland card from it. That player discards that card."
Duress77%
$0.06↓#3252↑0.3627.9 years↑
"Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card."
Render Speechless76%
$0.04↓#21156↓0.00↓0.4 years↓
"Target opponent reveals their hand. You choose a nonland card from it. That player discards that card."