Cybermat {2}
Artifact Creature — Robot
Skulk (This creature can't be blocked by creatures with greater power.)
Whenever this creature attacks and isn't blocked, it gets +X/+0 until end of turn, where X is the number of attacking artifact creatures.
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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.
Murk Dwellers 86%
$0.06#31203
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Sardian Avenger 83%
$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."
Pyreswipe Hawk 81%
$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."
Brazen Blademaster 81%
$0.15#20940
"Whenever this creature attacks while you control two or more artifacts, it gets +2/+1 until end of turn."
Redemptor Dreadnought 80%
$0.34#16858
"Whenever this creature attacks, if a card is exiled with it, it gets +X/+X until end of turn, where X is the power of the exiled card."
Akroan Hoplite 80%
$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."