Iron-Craw Crusher 
Artifact Creature — Wurm
$0.20 #18343 0.00 3.8 years
Prototype 

— 2/5 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
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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Cards similar to Iron-Craw Crusher 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.
Syr Faren, the Hengehammer98%
$0.22↑#162180.31↑6.9 years↑
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Gruul Beastmaster94%
$0.09↓#24543↓0.25↑7.6 years↑
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Wildwood Mentor92%
$0.39↑#13784↑0.043.0 years
"Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is this creature's power."
Firebird, Blazing Ranger92%
$0.26↑#162200.000.2 years↓
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
Rubblebelt Rioters92%
$0.19↓#181060.12↑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."
Tuya Bearclaw91%
$0.26↑#10523↑0.24↑5.8 years↑
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Ashroot Animist91%
$0.26↑#9286↑0.16↑1.8 years↓
"Whenever this creature attacks, another target creature you control gains trample and gets +X/+X until end of turn, where X is this creature's power."
Wild Beastmaster90%
$0.22↑#8469↑0.10↑13.9 years↑
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Cultivator of Blades90%
$0.30↑#9823↑0.33↑9.9 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."
Unruly Krasis89%
$0.41↑#219640.062.5 years↓
"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."
+1 more matching line
Amy Rose88%
$1.67↑#8049↑0.63↑1.1 years↓
"Whenever this card attacks, attach up to one target Equipment to her. Then up to one other target attacking creature gets +X/+0 until end of turn, where X is this card's power."
War Machine, Legacy of Iron88%
$0.17↓#217920.000.2 years↓
"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."
Mortis Dogs86%
$0.08↓#27497↓0.27↑15.3 years↑
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Krenko, Tin Street Kingpin86%
$2.63↑#894↑0.42↑7.3 years↑
"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."