Cemetery Puca {1}{U/B}{U/B}
Creature — Shapeshifter
Whenever a creature dies, you may pay {1}. If you do, this creature becomes a copy of that creature, except it has this ability.
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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.
Digsite Conservator 87%
$0.15#18713
"When this creature dies, you may pay {4}. If you do, discover 4."
Insidious Bookworms 86%
$0.15#28531
"When this creature dies, you may pay {1}{B}. If you do, target player discards a card at random."
Tenacious Dead 84%
$0.31#13188
"When this creature dies, you may pay {1}{B}. If you do, return it to the battlefield tapped under its owner's control."
Cyclops Superconductor 84%
$0.17#16725
"When this creature dies, you may pay {E}{E}{E}. When you do, this creature deals damage equal to its power to any target."
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."
Museum Nightwatch 81%
$0.05#27591
"When this creature dies, create a 2/2 white and blue Detective creature token."
Foster 81%
$0.26#21103
"Whenever a creature you control dies, you may pay {1}. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest into your graveyard."
Liege of the Hollows 81%
$5.52#19842
"When this creature dies, each player may pay any amount of mana. Then each player creates a number of 1/1 green Squirrel creature tokens equal to the amount of mana they paid this way."
Skirk Drill Sergeant 81%
$0.28#21175
"Whenever this creature or another Goblin dies, you may pay {2}{R}. If you do, reveal the top card of your library. If it's a Goblin permanent card, put it onto the battlefield. Otherwise, put it into your graveyard."
Meathook Massacre II 81%
$2.55#3054
"Whenever a creature you control dies, you may pay 3 life. If you do, return that card under your control with a finality counter on it."
Lost Auramancers 81%
$0.22#16428
"When this creature dies, if it had no time counters on it, you may search your library for an enchantment card, put it onto the battlefield, then shuffle."
Giant Albatross 81%
$0.15#29288
"When this creature dies, you may pay {1}{U}. If you do, for each creature that dealt damage to this creature this turn, destroy that creature unless its controller pays 2 life. A creature destroyed this way can't be regenerated."
Deathknell Berserker 80%
$0.16#24074
"When this creature dies, if its power was 3 or greater, create a 2/2 black Zombie Berserker creature token."
Penumbra Wurm 80%
$0.34#13828
"When this creature dies, create a 6/6 black Wurm creature token with trample."