Valor 
Creature — Incarnation
$0.44 #13828 0.13 24.4 years
First strike
As long as this card is in your graveyard and you control a Plains, creatures you control have first strike.
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Cards similar to Valor 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.
Knighthood83%
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"Creatures you control have first strike."
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"During your turn, creatures you control with +1/+1 counters on them have first strike."
+1 more matching line
Iron Lance70%
$0.22↓#31564↓0.1127.0 years↑
", 
: Target creature gains first strike until end of turn."
, : Target creature gains first strike until end of turn."
Fyndhorn Bow70%
$0.22↓#30500↓0.2031.4 years↑
", : Target creature gains first strike until end of turn."
, : Target creature gains first strike until end of turn."