Overseer of the Damned {5}{B}{B}
Creature — Demon
Flying
When this creature enters, you may destroy target creature.
Whenever a nontoken creature an opponent controls dies, create a tapped 2/2 black Zombie creature token.
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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.
Open the Graves 92%
$0.45#3747
"Whenever a nontoken creature you control dies, create a 2/2 black Zombie creature token."
Noxious Gearhulk 91%
$0.41#968
"When this creature enters, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness."
Golgari Germination 87%
$0.55#7779
"Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token."
Moonstone Eulogist 84%
$0.26#7627
"Whenever a creature an opponent controls dies, you create a Blood token."
Gutter Grime 83%
$0.38#13077
"Whenever a nontoken creature you control dies, put a slime counter on this enchantment, then create a green Ooze creature token with "This token's power and toughness are each equal to the number of slime counters on this card.""
Serpent Assassin 83%
$2.07#22154
"When this creature enters, you may destroy target nonblack creature."
Hawkeye, Avenging Archer 83%
$0.37#21716
"Whenever a creature an opponent controls dies, if this card dealt damage to it this turn, draw a card."
Akki Ember-Keeper 83%
$0.22#17849
"Whenever a nontoken modified creature you control dies, create a 1/1 colorless Spirit creature token."
Sek'Kuar, Deathkeeper 82%
$0.31#16056
"Whenever another nontoken creature you control dies, create a 3/1 black and red Graveborn creature token with haste."
Remembrance 82%
$9.46#12714
"Whenever a nontoken creature you control dies, you may search your library for a card with the same name as that creature, reveal it, put it into your hand, then shuffle."
Xathrid Necromancer 82%
$0.33#9940
"Whenever this creature or another Human creature you control dies, create a tapped 2/2 black Zombie creature token."
Wilhelt, the Rotcleaver 82%
$8.86#2663
"Whenever another Zombie you control dies, if it didn't have decayed, create a 2/2 black Zombie creature token with decayed."
Ghoulish Procession 82%
$0.27#5033
"Whenever one or more nontoken creatures die, create a 2/2 black Zombie creature token with decayed. This ability triggers only once each turn."
Headless Rider 81%
$4.24#2825
"Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token."
Village Pillagers 81%
$0.32#6070
"Whenever a creature an opponent controls with a counter on it dies, you create a tapped Treasure token."
Ratadrabik of Urborg 81%
$1.86#2782
"Whenever another legendary creature you control dies, create a token that's a copy of that creature, except it's not legendary and it's a 2/2 black Zombie in addition to its other colors and types."
Massacre Girl, Known Killer 81%
$0.65#1652
"Whenever a creature an opponent controls dies, if its toughness was less than 1, draw a card."
The Balrog, Flame of Udûn 81%
$0.39#20789
"When a legendary creature an opponent controls dies, put this card on the bottom of its owner's library."
Toxrill, the Corrosive 80%
$17.49#2331
"Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token."