Cybermat 
Artifact Creature — Robot
$0.32 #12614 0.25 3.0 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%
$0.07↓#31790↓0.00↓32.2 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Elusive Tormentor // Insidious Mist74%
$0.24↓#21177↓0.00↓10.5 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%
$0.58↑#31817↓0.07↓30.4 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Swamp Mosquito73%
$0.15↓#19522↓0.3130.4 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Suq'Ata Assassin73%
$0.55↑#22683↓0.2729.7 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Guiltfeeder73%
$1.34↑#6926↑0.39↑24.4 years↑
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Goblin Vandal72%
$0.24↓#23133↓0.10↓29.4 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%
$0.17↓#28716↓0.11↓30.0 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Abyssal Nightstalker71%
$0.49↑#27803↓0.2128.3 years↑
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Kukemssa Pirates70%
$2.25↑#23078↓0.71↑30.0 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."
Stinkdrinker Bandit70%
$0.23↓#132130.05↓18.7 years↑
"Whenever a Rogue you control attacks and isn't blocked, it gets +2/+1 until end of turn."
Merchant Ship70%
$42.56↑#28771↓0.12↓32.8 years↑
"Whenever this creature attacks and isn't blocked, you gain 2 life."