Heirs of Stromkirk 
Creature — Vampire
$0.11 #24144 0.38 14.5 years
Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
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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 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
Slith Firewalker100%
$0.16↑#283450.11↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
+1 more matching line
Erdwal Ripper100%
$0.20↑#257890.07↓14.7 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#29138↓0.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol100%
$0.05↓#276920.12↓15.1 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."
Havengul Vampire98%
$0.13↑#215840.19↓14.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter96%
$0.10↓#29909↓0.00↓23.0 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."
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."
Vorosh, the Hunter96%
$0.85↑#199390.24↓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 Exterminator94%
$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↓#283850.06↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble92%
$0.23↑#13520↑0.14↓15.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Necropolis Regent92%
$0.44↑#4135↑0.19↓14.0 years
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Briar Hydra90%
$0.31↑#13070↑0.13↓4.1 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."
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."
Drana, Liberator of Malakir89%
$1.10↑#1550↑0.18↓11.0 years↓
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each attacking creature you control."
Arcbound Slith88%
$0.37↑#9170↑0.3522.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."