Necropolis Regent 
Creature — Vampire
$0.44 #4135 0.19 14.0 years
Flying
Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it.
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Cards similar to Necropolis Regent 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.
Conclave Sledge-Captain94%
$1.52↑#7737↓0.153.5 years↓
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent94%
$0.25↓#14026↓0.47↑5.2 years↓
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
+1 more matching line
Falkenrath Marauders92%
$0.26↓#16274↓0.00↓15.1 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Heirs of Stromkirk92%
$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 Ascendant92%
$0.07↓#25371↓0.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Predator91%
$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 Firewalker91%
$0.16↓#28345↓0.1123.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster91%
$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 Ripper91%
$0.20↓#25789↓0.07↓14.7 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol91%
$0.05↓#27692↓0.1215.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Havengul Vampire88%
$0.13↓#21584↓0.1914.5 years
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Aveline de Grandpré88%
$0.47↑#7560↓0.242.3 years↓
"Whenever a creature you control with deathtouch deals combat damage to a player, put that many +1/+1 counters on that creature."
Briar Hydra86%
$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."
Vorosh, the Hunter86%
$0.85↑#19939↓0.2419.7 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."
Curse of Stalked Prey86%
$0.77↑#12506↓0.2915.1 years↑
"Whenever a creature deals combat damage to enchanted player, put a +1/+1 counter on that creature."
Power Fist86%
$11.52↑#1830↑0.38↑2.6 years↓
"Equipped creature has trample and "Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it.""
Slith Bloodletter85%
$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 Thief85%
$0.06↓#23214↓0.00↓5.2 years↓
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Szadek, Lord of Secrets85%
$0.21↓#18869↓0.38↑21.0 years↑
"If this card would deal combat damage to a player, instead put that many +1/+1 counters on this card and that player mills that many cards."
Quilled Greatwurm84%
$2.85↑#2242↑0.35↑1.9 years↓
"Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it."