Slith Bloodletter 

Creature — Slith
$0.10 #29909 0.00 23.0 years
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
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Cards similar to Slith Bloodletter 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.
Slith Predator97%
$0.11↑#291380.0023.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker97%
$0.16↑#283450.11↑23.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol97%
$0.05↓#276920.12↑15.1 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster97%
$0.31↑#13568↑0.0014.7 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper97%
$0.20↑#257890.0714.7 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk96%
$0.11↑#241440.38↑14.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant96%
$0.07↓#253710.0023.0 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders96%
$0.26↑#16274↑0.0015.1 years↓
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Havengul Vampire96%
$0.13↑#21584↑0.19↑14.5 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief92%
$0.06↓#23214↑0.005.2 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Vorosh, the Hunter92%
$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."
Bloodcrazed Neonate92%
$0.09↓#22879↑0.0015.1 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."