Necropolis Regent {3}{B}{B}{B}
Creature — Vampire
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 that do something similar 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.
Quilled Greatwurm 94%
$2.77#2317
"Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it."
Sphere Grid 92%
$8.87#1407
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Cazur, Ruthless Stalker 92%
$0.38#7935
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Shaman of the Great Hunt 92%
$0.98#11770
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on it."
Conclave Sledge-Captain 86%
$1.76#7205
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent 86%
$0.31#13389
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Etched Slith 84%
$0.17#17179
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. When you do, you may remove a counter from another target permanent or opponent."
Noble Purpose 83%
$0.67#15295
"Whenever a creature you control deals combat damage, you gain that much life."
Slith Predator 83%
$0.12#28589
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Exterminator 83%
$0.24#17576
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter 83%
$0.12#29236
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker 83%
$0.14#27699
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodmad Vampire 83%
$0.20#12098
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble 83%
$0.12#13270
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief 83%
$0.21#22501
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster 83%
$0.31#13295
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodcrazed Neonate 83%
$0.13#22367
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant 83%
$0.05#24600
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk 83%
$0.11#23476
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."