Bioplasm 


Creature — Ooze
Whenever this creature attacks, exile the top card of your library. If it's a creature card, this creature gets +X/+Y until end of turn, where X is the exiled creature card's power and Y is its toughness.
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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.
Synth Eradicator 89%
$0.32#8467
"Whenever this creature attacks, exile the top card of your library. You may get {E}{E} . If you don't, you may play that card this turn."
Caves of Chaos Adventurer 89%
$0.44#7374
"Whenever this creature attacks, exile the top card of your library. If you've completed a dungeon, you may play that card this turn without paying its mana cost. Otherwise, you may play that card this turn."
Mezzio Mugger 85%
$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."
Bomat Courier 85%
$0.22#12903
"Whenever this creature attacks, exile the top card of your library face down."
Grime Gorger 84%
$0.27#21213
"Whenever this creature attacks, exile up to one card of each card type from defending player's graveyard. Put a +1/+1 counter on this creature for each card exiled this way."
Robber of the Rich 84%
$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."
Daredevil, Fearless Fighter 83%
$3.56#19255
"Whenever this card attacks, exile the top card of your library. this card deals damage to you equal to that card's mana value. You may play it this turn."
Laelia, the Blade Reforged 83%
$0.30#1297
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
Gila Courser 83%
$0.17#15641
"Whenever this creature attacks while saddled, exile the top card of your library. Until the end of your next turn, you may play that card."
Woodvine Elemental 81%
$0.20#26104
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, attacking creatures you control get +1/+1 until end of turn. Then each player draws a card."
Nathan Drake, Treasure Hunter 81%
$4.72#14996
"Whenever this card attacks, exile the top card of each player's library. You may cast a spell from among those cards."
Tempered in Solitude 80%
$0.26#12038
"Whenever a creature you control attacks alone, exile the top card of your library. You may play that card this turn."