Prince of Thralls 
Creature — Demon
$4.02 #14906 0.47 17.9 years
Whenever a permanent an opponent controls is put into a graveyard, put that card onto the battlefield under your control unless that opponent pays 3 life.
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Cards similar to Prince of Thralls 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.
Tergrid, God of Fright // Tergrid's Lantern72%
$18.45↑#1560↑2.80↑5.6 years↓
"Whenever an opponent sacrifices a nontoken permanent or discards a permanent card, you may put that card from a graveyard onto the battlefield under your control."
Zareth San, the Trickster70%
$0.23↓#10671↑0.29↓5.9 years↓
"Whenever this card deals combat damage to a player, you may put target permanent card from that player's graveyard onto the battlefield under your control."
Meathook Massacre II70%
$2.42↓#3002↑0.561.9 years↓
"Whenever a creature an opponent controls dies, they may pay 3 life. If they don't, return that card under your control with a finality counter on it."