Casey Jones, Back Alley Brute 
Legendary Creature — Human Berserker
$0.31 #7643 0.00 0.5 years
Menace
Whenever Casey Jones attacks, put a +1/+1 counter on target attacking creature.
Whenever you put one or more +1/+1 counters on a creature you control, Casey Jones deals that much damage to target opponent.
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Cards similar to Casey Jones, Back Alley Brute 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.
Oran-Rief Ooze90%
$0.30↓#78520.56↑5.9 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Armasaur Guide88%
$0.17↓#17748↓0.051.8 years↑
"Whenever you attack with three or more creatures, put a +1/+1 counter on target creature you control."
Leatherhead, Iron Gator86%
$0.30↓#9221↓0.000.5 years
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Ant-Man, Colony Commander86%
$0.20↓#16701↓0.000.2 years
"Whenever this card attacks, you may pay 
. When you do, put a +1/+1 counter on target creature."
. When you do, put a +1/+1 counter on target creature."+1 more matching line
Elite Scaleguard86%
$0.09↓#88080.0611.6 years↑
"Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls."
Rubblebelt Raiders85%
$0.13↓#18440↓0.31↑13.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on it for each attacking creature you control."
Dromoka Captain84%
$0.11↓#26142↓0.0011.4 years↑
"Whenever this creature attacks, bolster 1."
Armory of Iroas84%
$0.22↓#79370.22↑12.3 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
Bone Sabres84%
$5.73↑#5958↑0.24↑3.9 years↑
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Grime Gorger84%
$0.23↓#21790↓0.33↑4.4 years↑
"Menace"
Goliath Truck83%
$0.48↑#13757↓0.22↑3.9 years↑
"Whenever this Vehicle attacks, put two +1/+1 counters on another target attacking creature."
Ornery Tumblewagg82%
$0.34↑#4990↑0.90↑2.4 years↑
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
+1 more matching line
Trygon Prime82%
$0.41↑#11870↓0.20↑3.9 years↑
"Whenever this creature attacks, put a +1/+1 counter on it and a +1/+1 counter on up to one other target attacking creature. That creature can't be blocked this turn."
Arcbound Tracker82%
$0.20↓#9745↓0.24↑5.2 years↑
"Menace"
Shalai and Hallar82%
$6.63↑#4050↑0.36↑3.4 years↑
"Whenever one or more +1/+1 counters are put on a creature you control, this card deals that much damage to target opponent."
Surgical Suite // Hospital Room81%
$0.28↓#84360.25↑1.9 years↑
"Whenever you attack, put a +1/+1 counter on target attacking creature."
Fangren Firstborn81%
$2.32↑#15553↓0.17↑22.6 years↑
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature."
Giant Beaver80%
$0.14↓#18750↓0.002.4 years↑
"Whenever this creature attacks while saddled, put a +1/+1 counter on target creature that saddled it this turn."
Tempered Veteran80%
$0.16↓#22943↓0.36↑6.2 years↑
"
, 
: Put a +1/+1 counter on target creature with a +1/+1 counter on it."
, : Put a +1/+1 counter on target creature with a +1/+1 counter on it."
Deputized Protester80%
$0.06↓#26722↓0.22↑10.0 years↑
"Menace"