Nightmare Shepherd {2}{B}{B}
Enchantment Creature — Demon
Flying
Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.
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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.
Myrkul, Lord of Bones 98%
$0.25#9822
"Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that card, except it's an enchantment and loses all other card types."
Hofri Ghostforge 96%
$0.22#7032
"Whenever another nontoken creature you control dies, exile it. If you do, create a token that's a copy of that creature, except it's a Spirit in addition to its other types and it has "When this token leaves the battlefield, return the exiled card to its owner's graveyard.""
Chaos Shrine's Black Crystal 85%
$4.53#13337
"Whenever a nontoken creature you control dies, exile it."
Shadow Urchin 85%
$0.22#14813
"Whenever a creature you control with one or more counters on it dies, exile that many cards from the top of your library. Until your next end step, you may play those cards."
Sothera, the Supervoid 84%
$1.71#5357
"Whenever a creature you control dies, each opponent chooses a creature they control and exiles it."
Curse of Clinging Webs 84%
$2.17#7527
"Whenever a nontoken creature enchanted player controls dies, exile it and you create a 1/2 green Spider creature token with reach."
Shelob, Dread Weaver 83%
$0.37#5753
"Whenever a nontoken creature an opponent controls dies, exile it."
Mimic Vat 83%
$0.50#2300
"Whenever a nontoken creature dies, you may exile that card. If you do, return each other card exiled with this artifact to its owner's graveyard."
Ratadrabik of Urborg 83%
$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."
Kinzu of the Bleak Coven 82%
$0.33#12830
"Whenever another nontoken creature you control dies, you may pay 2 life and exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and has toxic 1."
Sek'Kuar, Deathkeeper 81%
$0.31#16056
"Whenever another nontoken creature you control dies, create a 3/1 black and red Graveborn creature token with haste."
The Balrog of Moria 81%
$0.42#4763
"When this card dies, you may exile it. When you do, for each opponent, exile up to one target creature that player controls."
Rundvelt Hordemaster 81%
$2.03#4608
"Whenever this creature or another Goblin you control dies, exile the top card of your library. If it's a Goblin creature card, you may cast that card until the end of your next turn."
Golgari Germination 80%
$0.55#7779
"Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token."
Unscythe, Killer of Kings 80%
$1.83#17974
"Whenever a creature dealt damage by equipped creature this turn dies, you may exile that card. If you do, create a 2/2 black Zombie creature token."
Toshiro Umezawa 80%
$5.03#12668
"Whenever a creature an opponent controls dies, you may cast target instant card from your graveyard. If that spell would be put into a graveyard, exile it instead."