Springjack Knight 

Creature — Kithkin Knight
$0.17 #28729 0.00 19.0 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.
Marvo, Deep Operative78%
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"Whenever this card attacks, clash with defending player."
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"Whenever this creature attacks, other creatures you control gain double strike until end of turn."
Sentry Oak76%
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"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."
Fistful of Force76%
$0.14↓#287410.30↑19.0 years
"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."
Rafiq of the Many74%
$0.31↑#10982↑0.26↑18.0 years
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
War Machine, Avenging Arsenal74%
$0.39↑#11067↑0.33↑0.3 years↓
"Whenever this card attacks, attacking modified creatures you control gain double strike until end of turn."
Ticket Booth // Tunnel of Hate72%
$0.12↓#11036↑0.072.1 years↓
"Whenever you attack, target attacking creature gains double strike until end of turn."
Chocobo Knights72%
$0.31↑#4184↑0.53↑1.4 years↓
"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."
Blood Mist71%
$0.16↓#9095↑0.29↑10.2 years↓
"At the beginning of combat on your turn, target creature you control gains double strike until end of turn."
Squall, SeeD Mercenary70%
$1.58↑#3550↑0.20↑1.4 years↓
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Momentum Rumbler70%
$0.19↑#22539↑0.19↑6.5 years↓
"Whenever this creature attacks, if it has first strike, it gains double strike until end of turn."