Cybermat 
Artifact Creature — Robot
$0.25 #12328 0.56 2.9 years
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 similar to Cybermat 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 Dwellers88%
$0.06↓#31512↓0.20↓32.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Elusive Tormentor // Insidious Mist74%
$0.21↓#20732↓0.07↓10.4 years↑
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Keeper of Tresserhorn74%
$0.64↑#31458↓0.25↓30.2 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Suq'Ata Assassin73%
$0.54↑#22214↓0.32↓29.6 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Swamp Mosquito73%
$0.14↓#19244↓0.07↓30.2 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Guiltfeeder73%
$1.43↑#6805↑0.5024.3 years↑
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Goblin Vandal72%
$0.25#22752↓0.28↓29.2 years↑
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
Crypt Cobra72%
$0.16↓#28456↓0.75↑29.9 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Stinkdrinker Bandit70%
$0.19↓#129440.00↓18.6 years↑
"Whenever a Rogue you control attacks and isn't blocked, it gets +2/+1 until end of turn."
Abyssal Nightstalker70%
$0.49↑#27591↓0.27↓28.2 years↑
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Kukemssa Pirates70%
$1.96↑#22655↓0.5029.9 years↑
"Whenever this creature attacks and isn't blocked, you may gain control of target artifact defending player controls. If you do, this creature assigns no combat damage this turn."
Merchant Ship70%
$43.78↑#28544↓0.42↓32.7 years↑
"Whenever this creature attacks and isn't blocked, you gain 2 life."