Gruul Beastmaster 

Creature — Human Shaman
$0.09 #24543 0.25 7.6 years
Riot (This creature enters with your choice of a +1/+1 counter or haste.)
Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power.
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Cards similar to Gruul Beastmaster 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 card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
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"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
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Wild Beastmaster90%
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"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Unruly Krasis90%
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"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Wildwood Mentor89%
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"Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is this creature's power."
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"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Rubblebelt Rioters89%
$0.19↑#18106↑0.12↓7.3 years
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Firebird, Blazing Ranger88%
$0.26↑#16220↑0.00↓0.2 years↓
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
War Machine, Legacy of Iron88%
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"At the beginning of combat on your turn, another target creature you control gets +X/+0 until end of turn, where X is this card's power."
Cultivator of Blades87%
$0.30↑#9823↑0.339.9 years↑
"Whenever this creature attacks, you may have other attacking creatures get +X/+X until end of turn, where X is this creature's power."
Krenko, Tin Street Kingpin85%
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"Whenever this card attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to this card's power."
Mortis Dogs84%
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"Whenever this creature attacks, it gets +2/+0 until end of turn."