Lich's Mastery 



Legendary Enchantment
Hexproof
You can't lose the game.
Whenever you gain life, draw that many cards.
Whenever you lose life, for each 1 life you lost, exile a permanent you control or a card from your hand or graveyard.
When Lich's Mastery leaves the battlefield, you lose the game.
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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.
Marina Vendrell's Grimoire 100%
$0.31#7488
"Whenever you gain life, draw that many cards."
+1 more matching line
Nefarious Lich 87%
$3.76#14616
"If you would gain life, draw that many cards instead."
+1 more matching line
Nine Lives 86%
$0.68#6296
"When this enchantment leaves the battlefield, you lose the game."
+1 more matching line
Oath of Lim-Dûl 85%
$0.54#20966
"Whenever you lose life, for each 1 life you lost, sacrifice a permanent other than this enchantment unless you discard a card."