Invulnerability 

Instant
Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
The next time a source of your choice would deal damage to you this turn, prevent that damage.
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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.
Reverse Damage 99%
$0.38#18569
"The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way."
Intervention Pact 99%
$4.91#15430
"The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way."
Deflecting Palm 98%
$4.56#1152
"The next time a source of your choice would deal damage to you this turn, prevent that damage. If damage is prevented this way, this card deals that much damage to that source's controller."
New Way Forward 98%
$0.28#11362
"The next time a source of your choice would deal damage to you this turn, prevent that damage. When damage is prevented this way, this card deals that much damage to that source's controller and you draw that many cards."
Shadowbane 89%
$0.25#29914
"The next time a source of your choice would deal damage to you and/or creatures you control this turn, prevent that damage. If damage from a black source is prevented this way, you gain that much life."
Eye for an Eye 81%
#21964
"The next time a source of your choice would deal damage to you this turn, instead that source deals that much damage to you and this card deals that much damage to that source's controller."