Impetuous Protege {2}{R}
Creature — Human Warrior
Partner with Proud Mentor (When this creature enters, target player may put Proud Mentor into their hand from their library, then shuffle.)
Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among tapped creatures your opponents control.
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Cards that do something similar 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.
Orcish Siegemaster 95%
$0.37#4737
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Rubblebelt Rioters 95%
$0.17#17740
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
The Long Reach of Night // Animus of Night's Reach 93%
$0.22#11099
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of creature cards in defending player's graveyard."
Pyreswipe Hawk 91%
$0.27#8765
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest mana value among artifacts you control."
Reckless Pangolin 91%
$0.12#31018
"Whenever this creature attacks, it gets +1/+1 until end of turn."
Alpine Houndmaster 90%
$0.16#22386
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures."
Akroan Hoplite 90%
$0.07#15923
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of attacking creatures you control."
Slimy Piper 89%
$0.28#19663
"Whenever this creature attacks, it gets +1/+1 until end of turn. If you control four or more creatures, it gets +2/+2 and gains indestructible until end of turn instead."
Vile Deacon 89%
$0.18#25199
"Whenever this creature attacks, it gets +X/+X until end of turn, where X is the number of Clerics on the battlefield."
Sardian Avenger 88%
$1.62#7610
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of artifacts your opponents control."