Prince of Thralls 
Creature — Demon
$4.02 #15127 0.18 18.0 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%
$17.89↑#1589↑2.81↑5.7 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%
$0.25↓#11005↑0.30↑6.1 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."