Springjack Knight 

Creature — Kithkin Knight
$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. (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 Springjack Knight 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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"Target creature gets +2/+2 until end of turn. Clash with an opponent. If you win, that creature gets an additional +2/+2 and gains trample until end of turn."
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"Whenever you attack, target attacking creature gains double strike until end of turn."
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"At the beginning of combat on your turn, target creature you control gains double strike until end of turn."
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"Whenever this creature attacks, put a double strike counter on another target attacking creature."