Hell Mongrel {3}{B}
Creature — Nightmare Dog
Discard a card: This creature gets +1/+1 until end of turn.
Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
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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.
Pulsating Illusion 95%
$0.14#30968
"Discard a card: This creature gets +4/+4 until end of turn. Activate only once each turn."
Glint-Eye Nephilim 94%
$0.20#18168
"{1}, Discard a card: This creature gets +1/+1 until end of turn."
Erebos's Emissary 83%
$0.11#23379
"Discard a creature card: This creature gets +2/+2 until end of turn. If this permanent is an Aura, enchanted creature gets +2/+2 until end of turn instead."
Tarox Bladewing 81%
$0.42#29873
"Discard another card named this card: this card gets +X/+X until end of turn, where X is its power."
Prickly Marmoset 80%
$0.13#23230
"Whenever you cycle a card, this creature gets +2/+0 until end of turn."