Rev, Tithe Extractor {3}{B}
Legendary Creature — Human Rogue
Whenever you attack, target creature gains deathtouch until end of turn.
Whenever one or more creatures you control deal combat damage to a player, create a Treasure token, then look at the top card of that player's library and exile it face down. You may cast that card for as long as it remains exiled. (A Treasure token is an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
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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.
Stensian Sanguinist // Exsanguinate 99%
$4.63#5906
"Whenever you attack, target creature gains deathtouch until end of turn. Whenever that creature deals combat damage to a player this combat, this creature becomes prepared."
Orochi Soul-Reaver 92%
$10.26#3702
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token and manifest the top card of that player's library."
Rilsa Rael, Kingpin 88%
$0.13#6925
"Whenever you attack, target attacking creature gains deathtouch until end of turn. If you've completed a dungeon, that creature also gets +5/+0 and gains first strike and menace until end of turn."
Ragavan, Nimble Pilferer 87%
$43.62#271
"Whenever this card deals combat damage to a player, create a Treasure token and exile the top card of that player's library. Until end of turn, you may cast that card."
Knuckles the Echidna 84%
$16.74#2121
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token."
Professional Face-Breaker 84%
$5.65#214
"Whenever one or more creatures you control deal combat damage to a player, create a Treasure token."