Coiling Stalker {1}{G}
Creature — Snake Ninja
Ninjutsu {1}{G} ({1}{G}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, put a +1/+1 counter on target creature you control that doesn't have a +1/+1 counter on it.
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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.
Scurry of Squirrels 90%
$5.26#3199
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on target creature you control."
Bloodcrazed Neonate 85%
$0.13#22367
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant 85%
$0.05#24600
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk 85%
$0.11#23476
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Strider 85%
$0.10#27715
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper 85%
$0.25#25110
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Havengul Vampire 85%
$0.26#20873
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol 85%
$0.12#27043
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Arcbound Slith 85%
$0.55#8872
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Hexgold Slith 85%
$0.18#22586
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Predator 85%
$0.12#28589
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Exterminator 85%
$0.24#17576
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter 85%
$0.12#29236
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker 85%
$0.14#27699
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodmad Vampire 85%
$0.20#12098
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble 85%
$0.12#13270
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief 85%
$0.21#22501
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."