Comeuppance 
Instant
$4.53 #3044 0.44 11.8 years
Prevent all damage that would be dealt to you and planeswalkers you control this turn by sources you don't control. If damage from a creature source is prevented this way, Comeuppance deals that much damage to that creature. If damage from a noncreature source is prevented this way, Comeuppance deals that much damage to the source's controller.
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Cards similar to Comeuppance 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.
Channel Harm93%
$0.18↓#21259↓0.28↓11.6 years
"Prevent all damage that would be dealt to you and permanents you control this turn by sources you don't control. If damage is prevented this way, you may have this card deal that much damage to target creature."
Divine Deflection82%
$0.26↓#19938↓0.06↓14.3 years↑
"Prevent the next X damage that would be dealt to you and/or permanents you control this turn. If damage is prevented this way, this card deals that much damage to any target."
Deflecting Palm80%
$2.48↓#1138↑0.5111.9 years
"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."
Refraction Trap76%
$0.05↓#29329↓0.00↓16.6 years↑
"Prevent the next 3 damage that a source of your choice would deal to you and/or permanents you control this turn. If damage is prevented this way, this card deals that much damage to any target."
Vengeful Archon76%
$0.26↓#25620↓0.56↑16.1 years↑
"
: Prevent the next X damage that would be dealt to you this turn. If damage is prevented this way, this creature deals that much damage to target player or planeswalker."
: Prevent the next X damage that would be dealt to you this turn. If damage is prevented this way, this creature deals that much damage to target player or planeswalker."
Captain's Maneuver74%
$0.15↓#24369↓0.07↓25.3 years↑
"The next X damage that would be dealt to target creature, planeswalker, or player this turn is dealt to another target creature, planeswalker, or player instead."
Mirror Strike74%
$1.73↓#17657↓0.32↓26.3 years↑
"All combat damage that would be dealt to you this turn by target unblocked creature is dealt to its controller instead."
Acolyte's Reward72%
$0.18↓#18706↓0.00↓12.6 years
"Prevent the next X damage that would be dealt to target creature this turn, where X is your devotion to white. If damage is prevented this way, this card deals that much damage to any target."