Cavern Whisperer {4}{B}
Creature — Nightmare
Mutate {3}{B} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Menace (This creature can't be blocked except by two or more creatures.)
Whenever this creature mutates, each opponent discards a card.
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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.
Cloudpiercer 87%
$0.19#13312
"Whenever this creature mutates, you may discard a card. If you do, draw a card."
+1 more matching line
Wei Night Raiders 82%
#26037
"Whenever this creature deals damage to an opponent, that player discards a card."
Hypnotic Specter 81%
$1.92#8638
"Whenever this creature deals damage to an opponent, that player discards a card at random."
Skullknocker Ogre 81%
$0.06#29482
"Whenever this creature deals damage to an opponent, that player discards a card at random. If the player does, they draw a card."