Cheering Fanatic {1}{R}
Creature — Goblin
Whenever this creature attacks, choose a card name. Spells with the chosen name cost {1} less to cast this turn.
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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.
Conundrum Sphinx 87%
$0.32#17473
"Whenever this creature attacks, each player chooses a card name. Then each player reveals the top card of their library. If the card a player revealed has the name they chose, that player puts it into their hand. If it doesn't, that player puts it on the bottom of their library."
Smirking Spelljacker 84%
$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."
Burning-Tree Vandal 81%
$0.19#21076
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Null Group Biological Assets 81%
$0.08#25398
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Vaultbreaker 81%
$0.05#24386
"Whenever this creature attacks, you may discard a card. If you do, draw a card."
Gaea's Courser 81%
$0.04#24471
"Whenever this creature attacks, if there are three or more creature cards in your graveyard, draw a card."
Xantid Swarm 80%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Eternal of Harsh Truths 80%
$0.22#17420
"Whenever this creature attacks and isn't blocked, draw a card."
Yuan Shao's Infantry 80%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."