Sigarda's Vanguard 

Creature — Angel
$0.85 #8769 0.19 5.1 years
Flash
Flying
Whenever this creature enters or attacks, choose any number of creatures with different powers. Those creatures gain double strike until end of turn.
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Cards similar to Sigarda's Vanguard 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 this creature attacks, other creatures you control gain double strike until end of turn."
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"As long as this creature is paired with another creature, both creatures have double strike."
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"Whenever you attack, creatures you control with counters on them gain double strike until end of turn."
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"Whenever this card enters or attacks, target creature you control gains double strike and lifelink until end of turn."