Markov Blademaster 
Creature — Vampire Warrior
$0.31 #13568 0.00 14.7 years
Double strike (This creature deals both first-strike and regular combat damage.)
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
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Cards similar to Markov Blademaster 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 Predator100%
$0.11↓#29138↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker100%
$0.16↓#28345↓0.11↑23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol100%
$0.05↓#27692↓0.12↑15.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper100%
$0.20↓#25789↓0.0714.7 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk100%
$0.11↓#24144↓0.38↑14.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant100%
$0.07↓#25371↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Marauders100%
$0.26↓#162740.0015.1 years
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Havengul Vampire98%
$0.13↓#21584↓0.19↑14.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter97%
$0.10↓#29909↓0.0023.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodcrazed Neonate96%
$0.09↓#22879↓0.0015.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief96%
$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 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↓0.0014.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Strider94%
$0.09↓#28385↓0.0623.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble91%
$0.23↓#135200.14↑15.1 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Necropolis Regent91%
$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."
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#130700.13↑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."
Bloodmad Vampire89%
$0.07↓#125840.0710.5 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."