Infestation Sage 
Creature — Elf Warlock
When this creature dies, create a 1/1 black and green Insect creature token with flying.
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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.
Filigree Crawler 93%
$0.07#23311
"When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying."
Thopter Mechanic 93%
$0.20#16320
"When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying."
Elgaud Inquisitor 93%
$0.12#26868
"When this creature dies, create a 1/1 white Spirit creature token with flying."
Doomed Traveler 93%
$0.08#4960
"When this creature dies, create a 1/1 white Spirit creature token with flying."
Rukh Egg 92%
$0.44#20491
"When this creature dies, create a 4/4 red Bird creature token with flying at the beginning of the next end step."
Unwilling Vessel 92%
$0.16#16298
"When this creature dies, create an X/X blue Spirit creature token with flying, where X is the number of counters on this creature."
Hallowed Spiritkeeper 90%
$0.50#7844
"When this creature dies, create X 1/1 white Spirit creature tokens with flying, where X is the number of creature cards in your graveyard."
Jötun Owl Keeper 89%
$0.15#26058
"When this creature dies, create a 1/1 white Bird creature token with flying for each age counter on it."
Mausoleum Guard 89%
$0.14#20601
"When this creature dies, create two 1/1 white Spirit creature tokens with flying."
Triplicate Titan 89%
$1.54#2223
"When this creature dies, create a 3/3 colorless Golem artifact creature token with flying, a 3/3 colorless Golem artifact creature token with vigilance, and a 3/3 colorless Golem artifact creature token with trample."
Haunted Angel 87%
$0.34#23051
"When this creature dies, exile it and each other player creates a 3/3 black Angel creature token with flying."
Abzan Ascendancy 80%
$0.32#9840
"Whenever a nontoken creature you control dies, create a 1/1 white Spirit creature token with flying."