Cloudpiercer {4}{R}
Creature — Dinosaur
Mutate {3}{R} (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.)
Reach
Whenever this creature mutates, you may discard a card. If you do, draw 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.
Cavern Whisperer 87%
$0.22#9810
"Whenever this creature mutates, each opponent discards a card."
+1 more matching line
Hazoret's Monument 82%
$3.44#1878
"Whenever you cast a creature spell, you may discard a card. If you do, draw a card."