Oath of Lim-Dûl 

Enchantment
Whenever you lose life, for each 1 life you lost, sacrifice a permanent other than this enchantment unless you discard a card. (Damage dealt to you causes you to lose life.)
{B}{B}: Draw a card.
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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.
Lich's Tomb 86%
$2.74#15553
"Whenever you lose life, sacrifice a permanent for each 1 life you lost."
Lich's Mastery 85%
$0.84#7707
"Whenever you lose life, for each 1 life you lost, exile a permanent you control or a card from your hand or graveyard."
Marina Vendrell's Grimoire 82%
$0.31#7488
"Whenever you lose life, discard that many cards. Then if you have no cards in hand, you lose the game."