Havengul Vampire 
Creature — Vampire
$0.13 #21584 0.19 14.5 years
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
Whenever another creature dies, put a +1/+1 counter on this creature.
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Cards similar to Havengul Vampire 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.
Heirs of Stromkirk98%
$0.11↓#241440.38↑14.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Predator98%
$0.11↓#29138↓0.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker98%
$0.16↑#28345↓0.1123.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant98%
$0.07↓#253710.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol98%
$0.05↓#27692↓0.1215.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster98%
$0.31↑#13568↑0.00↓14.7 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper98%
$0.20↑#257890.07↓14.7 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders98%
$0.26↑#16274↑0.00↓15.1 years
"Whenever this creature deals combat damage to a player, put two +1/+1 counters 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."
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 Hunter94%
$0.85↑#199390.2419.7 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 Exterminator92%
$0.13#184570.00↓14.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Strider92%
$0.09↓#28385↓0.06↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Arcbound Slith90%
$0.37↑#9170↑0.35↑22.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Rockslide Elemental89%
$0.17↑#243930.1818.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Stromkirk Noble89%
$0.23↑#13520↑0.1415.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Briar Hydra89%
$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."
Necropolis Regent88%
$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."
Borborygmos88%
$0.38↑#173080.2420.7 years↑
"Whenever this card deals combat damage to a player, put a +1/+1 counter on each creature you control."