Vaultbreaker {3}{R}
Creature — Orc Rogue
Whenever this creature attacks, you may discard a card. If you do, draw a card.
Dash {2}{R} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)
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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.
Burning-Tree Vandal 100%
$0.19#21076
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Null Group Biological Assets 100%
$0.08#25398
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Abyssal Nightstalker 90%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Shrieking Specter 90%
$1.08#30458
"Whenever this creature attacks, defending player discards a card."
Eumidian Wastewaker 90%
$0.23#8218
"Whenever this creature attacks, you and defending player each discard a card or sacrifice a permanent. You draw a card for each land card put into a graveyard this way."
Cool but Rude 87%
$7.52#6077
"Whenever you attack, you may discard a card. If you do, draw a card."
+1 more matching line
Veronica, Dissident Scribe 87%
$0.34#8598
"Whenever this card attacks, you may discard a card. If you do, draw a card."
Smirking Spelljacker 86%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Azula, Ruthless Firebender 85%
$0.77#13694
"Whenever this card attacks, you may discard a card. Then you get an experience counter for each player who discarded a card this turn."
Academy Raider 84%
$0.10#20401
"Whenever this creature deals combat damage to a player, you may discard a card. If you do, draw a card."