Elder Brain {5}{B}{B}
Creature — Horror
Menace
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.
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Cards that do something similar 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.
Mezzio Mugger 82%
$0.32#12165
"Whenever this creature attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells."
Bane of Bala Ged 81%
$2.71#3255
"Whenever this creature attacks, defending player exiles two permanents they control."
Robber of the Rich 80%
$1.52#10249
"Whenever this creature attacks, if defending player has more cards in hand than you, exile the top card of their library. During any turn you attacked with a Rogue, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Boiling Rock Rioter 80%
$0.20#13348
"Whenever this creature attacks, you may cast an Ally spell from among cards you own exiled with this creature."