Slith Firewalker 
Creature — Slith
$0.16 #28345 0.11 23.0 years
Haste
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
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Cards similar to Slith Firewalker 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.
Erdwal Ripper100%
$0.20↑#257890.0714.7 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
+1 more matching line
Slith Predator100%
$0.11↓#291380.00↓23.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol100%
$0.05↓#276920.1215.1 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster100%
$0.31↑#13568↑0.00↓14.7 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk100%
$0.11↓#241440.38↑14.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant100%
$0.07↓#253710.00↓23.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders100%
$0.26↑#16274↑0.00↓15.1 years↓
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
+1 more matching line
Havengul Vampire98%
$0.13↓#21584↑0.1914.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter97%
$0.10↓#299090.00↓23.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodcrazed Neonate96%
$0.09↓#228790.00↓15.1 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief96%
$0.06↓#232140.00↓5.2 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Vorosh, the Hunter96%
$0.85↑#19939↑0.24↑19.7 years↓
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Falkenrath Exterminator95%
$0.13↓#18457↑0.00↓14.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Strider94%
$0.09↓#283850.0623.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble91%
$0.23↑#13520↑0.1415.1 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Necropolis Regent91%
$0.44↑#4135↑0.1914.0 years↓
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Borborygmos90%
$0.38↑#17308↑0.24↑20.7 years↓
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each creature you control."
Briar Hydra90%
$0.31↑#13070↑0.134.1 years↓
"Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control."
Bloodmad Vampire89%
$0.07↓#12584↑0.0710.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Arcbound Slith89%
$0.37↑#9170↑0.35↑22.7 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."