Guardian Angel 

Instant
Prevent the next X damage that would be dealt to any target this turn. Until end of turn, you may pay {1} any time you could cast an instant. If you do, prevent the next 1 damage that would be dealt to that permanent or player this turn.
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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.
Orim's Touch 82%
$0.05#31267
"Prevent the next 2 damage that would be dealt to any target this turn. If this spell was kicked, prevent the next 4 damage that would be dealt to that permanent or player this turn instead."
Mending Hands 80%
$0.18#29246
"Prevent the next 4 damage that would be dealt to any target this turn."
Sunfire Balm 80%
$0.05#30741
"Prevent the next 4 damage that would be dealt to any target this turn."
Orim's Cure 80%
$0.14#29485
"Prevent the next 4 damage that would be dealt to any target this turn."