Unnatural Hunger {3}{B}{B}
Enchantment — Aura
Enchant creature
At the beginning of the upkeep of enchanted creature's controller, this Aura deals damage equal to that creature's power to that player unless they sacrifice another creature of their choice.
click a line to search just that ability, click more to combine them
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.
Binding Agony 82%
$0.18#22550
"Whenever enchanted creature is dealt damage, this Aura deals that much damage to that creature's controller."
Curse of Thirst 80%
$0.27#10636
"At the beginning of enchanted player's upkeep, this Aura deals damage to that player equal to the number of Curses attached to them."