Marvo, Deep Operative 
Legendary Creature — Octopus Rogue
$0.61 #7434 0.13 2.6 years
Whenever Marvo attacks, clash with defending player. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)
Whenever you win a clash, draw a card. Then you may cast a spell from your hand with mana value 8 or less without paying its mana cost.
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Cards similar to Marvo, Deep Operative 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.
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"Whenever you clash and win, you may draw a card."
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$0.14↓#28396↓0.29↑18.9 years↑
"Whenever this creature attacks, clash with an opponent. If you win, target creature gains double strike until end of turn."
Sram's Expertise74%
$0.77↑#69070.199.6 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Oaken Brawler74%
$0.23↓#28241↓0.25↑18.9 years↑
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Adder-Staff Boggart74%
$0.16↓#26701↓0.1818.9 years↑
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Paperfin Rascal74%
$0.26↓#16605↓0.47↑18.9 years↑
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Buster Sword73%
$52.70↑#914↑0.96↑1.2 years↓
"Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that damage without paying its mana cost."
Bog Hoodlums72%
$0.09↓#21595↓0.00↓18.9 years↑
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Yahenni's Expertise72%
$0.42↓#86120.44↑9.6 years↑
"You may cast a spell with mana value 3 or less from your hand without paying its mana cost."
Rishkar's Expertise71%
$3.59↑#243↑0.42↑9.6 years↑
"You may cast a spell with mana value 5 or less from your hand without paying its mana cost."
Sentry Oak70%
$0.18↓#29584↓0.00↓18.9 years↑
"At the beginning of combat on your turn, you may clash with an opponent. If you win, this creature gets +2/+0 and loses defender until end of turn."
Tanufel Rimespeaker70%
$0.24↓#11913↓0.00↓0.6 years↓
"Whenever you cast a spell with mana value 4 or greater, draw a card."
Baral's Expertise70%
$0.24↓#3807↑0.47↑9.6 years↑
"You may cast a spell with mana value 4 or less from your hand without paying its mana cost."
Research the Deep70%
$0.37↓#12080↓0.71↑18.6 years↑
"Draw a card. Clash with an opponent. If you win, return this card to its owner's hand."
Epistolary Librarian70%
$0.37↓#13934↓0.00↓3.9 years↑
"Whenever this creature attacks, you may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of attacking creatures."