Chainsaw 
Artifact — Equipment
$1.04 #3796 0.18 1.9 years
When this Equipment enters, it deals 3 damage to up to one target creature.
Whenever one or more creatures die, put a rev counter on this Equipment.
Equipped creature gets +X/+0, where X is the number of rev counters on this Equipment.
Equip 
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Cards similar to Chainsaw 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.
Malefic Scythe90%
$0.14↓#18720↓0.00↓6.2 years↑
"Equipped creature gets +1/+1 for each soul counter on this Equipment."
+1 more matching line
Corrupt Eunuchs86%
$8.54↑#31416↓0.00↓27.3 years↑
"When this creature enters, it deals 2 damage to target creature."
Fire Imp86%
$0.05↓#30577↓0.2629.3 years↑
"When this creature enters, it deals 2 damage to target creature."
Goblin Commando86%
$0.17↓#26821↓0.86↑27.2 years↑
"When this creature enters, it deals 2 damage to target creature."
Flametongue Kavu85%
$0.10↓#12966↓0.2525.6 years↑
"When this creature enters, it deals 4 damage to target creature."
Hankyu82%
$0.17↓#21508↓0.33↑21.9 years↑
"Equip 
"
"
Explosive Shot80%
$0.11↓#19153↓0.00↓0.8 years↓
"this card deals 4 damage to target creature."
Banshee's Blade80%
$0.28↓#16044↓0.0922.9 years↑
"Equipped creature gets +1/+1 for each charge counter on this Equipment."
+1 more matching line
Breath of Fire78%
$0.11↓#26789↓0.218.2 years↑
"this card deals 2 damage to target creature."
Ragefire78%
$0.13↓#29394↓0.187.6 years↑
"this card deals 3 damage to target creature."
Command the Storm78%
$0.06↓#24685↓0.00↓7.9 years↑
"this card deals 5 damage to target creature."
Scorching Shot78%
$0.26↓#10503↓0.40↑2.4 years
"this card deals 5 damage to target creature."
Engulfing Eruption78%
$0.18↓#29979↓0.07↓7.2 years↑
"this card deals 5 damage to target creature."
Concentrated Fire78%
$0.17↓#26770↓0.00↓0.2 years↓
"this card deals 5 damage to target creature."
Electrify78%
$0.05↓#24586↓0.00↓9.4 years↑
"this card deals 4 damage to target creature."
Bombard78%
$0.05↓#15102↓0.278.6 years↑
"this card deals 4 damage to target creature."
Bathe in Dragonfire78%
$0.08↓#19538↓0.33↑11.6 years↑
"this card deals 4 damage to target creature."
Flame Slash78%
$0.17↓#7734↓0.2116.4 years↑
"this card deals 4 damage to target creature."
Fiery Finish78%
$0.05↓#27697↓0.06↓8.1 years↑
"this card deals 7 damage to target creature."
Heat Ray78%
$0.07↓#19943↓0.53↑27.9 years↑
"this card deals X damage to target creature."