Paperfin Rascal 
Creature — Merfolk Rogue
$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. (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.)
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Cards similar to Paperfin Rascal 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.
Oaken Brawler100%
$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 Boggart100%
$0.16↓#26701↓0.18↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Bog Hoodlums100%
$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."
Nath's Elite97%
$0.08↓#25535↓0.25↓18.9 years
"When this creature enters, clash with an opponent. If you win, put a +1/+1 counter on this creature."
Sentry Oak86%
$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."
Research the Deep82%
$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."
Pulling Teeth82%
$0.12↓#147140.25↓18.6 years
"Clash with an opponent. If you win, target player discards two cards. Otherwise, that player discards a card."
Ringskipper80%
$0.27↑#151840.21↓18.9 years
"When this creature dies, clash with an opponent. If you win, return this card to its owner's hand."
Lash Out79%
$0.13↓#27414↓0.05↓18.9 years
"this card deals 3 damage to target creature. Clash with an opponent. If you win, this card deals 3 damage to that creature's controller."
Springjack Knight78%
$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."
Hoarder's Greed78%
$0.30↑#9984↑0.31↓18.9 years
"You lose 2 life and draw two cards, then clash with an opponent. If you win, repeat this process."
Pollen Lullaby76%
$0.29↑#191830.95↑18.9 years
"Prevent all combat damage that would be dealt this turn. Clash with an opponent. If you win, creatures that player controls don't untap during the player's next untap step."
Marvo, Deep Operative74%
$0.61↑#7434↑0.13↓2.6 years↓
"Whenever this card attacks, clash with defending player."