Intellect Devourer 
Creature — Horror
$0.37 #7421 0.37 4.2 years
Devour Intellect — When this creature enters, each opponent exiles a card from their hand until this creature leaves the battlefield.
Body Thief — You may play lands and cast spells from among cards exiled with this creature. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.
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Cards similar to Intellect Devourer 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.
Valki, God of Lies // Tibalt, Cosmic Impostor81%
$3.32↑#61120.55↑5.6 years↑
"When this card enters, each opponent reveals their hand. For each opponent, exile a creature card they revealed this way until this card leaves the battlefield."
+1 more matching line
Brain Maggot78%
$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 Freebooter78%
$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."
Elder Brain76%
$0.62↑#3886↑0.69↑4.2 years
"Whenever this creature attacks a player, exile all cards from that player's hand, then they draw that many cards. You may play lands and cast spells from among the exiled cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it."
Cloak and Dagger, Entwined76%
$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."
Nightveil Specter75%
$0.52↑#87610.88↑13.6 years↑
"You may play lands and cast spells from among cards exiled with this creature."
Kheru Mind-Eater75%
$0.69↑#16840↓0.26↓9.0 years↑
"You may look at cards exiled with this creature, and you may play lands and cast spells from among those cards."
+1 more matching line
Deep-Cavern Bat75%
$0.38↑#80800.21↓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."
Hypnox75%
$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."
Brainstealer Dragon72%
$8.42↑#2207↑0.48↑4.2 years
"At the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it."
Haldan, Avid Arcanist70%
$0.53↑#10968↓0.306.4 years↑
"You may play lands and cast noncreature spells from among cards you exiled that have fetch counters on them, and you may spend mana as though it were mana of any color to cast those spells."
Induced Amnesia70%
$0.22↓#19245↓0.358.6 years↑
"When this enchantment enters, target player exiles all cards from their hand face down, then draws that many cards."
King Narfi's Betrayal70%
$0.20↓#8922↓0.355.6 years↑
"Until end of turn, you may cast spells from among cards exiled with this Saga, and you may spend mana as though it were mana of any color to cast those spells."
Wormfang Behemoth70%
$0.23↓#30122↓0.00↓24.3 years↑
"When this creature enters, exile all cards from your hand."