Elder Brain 
Creature — Horror
$0.62 #3886 0.69 4.2 years
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 similar to Elder Brain 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.
Reno and Rude82%
$0.23↓#12763↓0.36↓1.2 years↓
"Menace"
Bismuth Mindrender80%
$0.36↓#7309↓0.652.2 years↓
"Menace"
Black Widow, Super Spy78%
$1.61↑#14925↓0.00↓0.2 years↓
"Menace"
Intellect Devourer76%
$0.37↓#7421↓0.37↓4.2 years
"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."
Byway Barterer76%
$0.31↓#11534↓0.21↓2.1 years↓
"Menace"
Kheru Mind-Eater74%
$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
Brainstealer Dragon74%
$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."
Death Tyrant74%
$2.24↑#8686↓0.00↓5.1 years
"Menace"
Ghost-Spider, Gwen Stacy73%
$10.71↑#11175↓0.41↓0.9 years↓
"Menace"
Deputized Protester72%
$0.06↓#26722↓0.22↓10.0 years↑
"Menace"
Robber of the Rich72%
$1.65↑#10436↓0.646.9 years↑
"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."
Brawl-Bash Ogre72%
$0.12↓#29829↓0.22↓8.1 years↑
"Menace"
Fiend of the Shadows71%
$0.22↓#17325↓0.95↑14.6 years↑
"Whenever this creature deals combat damage to a player, that player exiles a card from their hand. You may play that card for as long as it remains exiled."
Nightveil Specter70%
$0.52↓#8761↓0.88↑13.6 years↑
"You may play lands and cast spells from among cards exiled with this creature."
Etali, Primal Storm70%
$0.44↓#266↑0.85↑8.6 years↑
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Crypt Feaster70%
$0.08↓#20359↓0.05↓1.8 years↓
"Menace"
Mayhem Patrol70%
$0.21↓#18820↓0.42↓4.4 years
"Menace"
Grime Gorger70%
$0.23↓#21790↓0.33↓4.4 years
"Menace"
Mezzio Mugger70%
$0.33↓#12858↓0.07↓4.4 years
"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."
Khenra Scrapper70%
$0.07↓#27981↓1.07↑9.1 years↑
"Menace"