Ghoulish Procession 

Enchantment
Whenever one or more nontoken creatures die, create a 2/2 black Zombie creature token with decayed. This ability triggers only once each turn. (A creature with decayed can't block. When it attacks, sacrifice it at end of combat.)
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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 88%
$0.45#3747
"Whenever a nontoken creature you control dies, create a 2/2 black Zombie creature token."
Doomed Dissenter 84%
$0.23#7644
"When this creature dies, create a 2/2 black Zombie creature token."
Xathrid Necromancer 83%
$0.33#9940
"Whenever this creature or another Human creature you control dies, create a tapped 2/2 black Zombie creature token."
Hobbling Zombie 82%
$0.23#16192
"When this creature dies, create a 2/2 black Zombie creature token with decayed."
Adorned Crocodile 82%
$0.15#19999
"When this creature dies, create a 2/2 black Zombie Druid creature token."
Overseer of the Damned 82%
$0.37#3403
"Whenever a nontoken creature an opponent controls dies, create a tapped 2/2 black Zombie creature token."
Headless Rider 82%
$4.24#2825
"Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token."
Rotlung Reanimator 81%
$17.63#15272
"Whenever this creature or another Cleric dies, create a 2/2 black Zombie creature token."