Arna Kennerüd, Skycaptain 



Legendary Creature — Human Knight
$0.42 #7427 0.42 2.2 years
Flying, lifelink
Ward—Discard a card.
Whenever a modified creature you control attacks, double the number of each kind of counter on it. Then for each nontoken permanent attached to it, create a token that's a copy of that permanent attached to that creature.
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Cards similar to Arna Kennerüd, Skycaptain 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.
Byrke, Long Ear of the Law74%
$6.85↑#5927↑0.29↓2.1 years
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Kalonian Hydra70%
$5.87↑#1120↑0.4513.1 years↑
"Whenever this creature attacks, double the number of +1/+1 counters on each creature you control."