Reverse Polarity 
Instant
$0.25 #30043 0.39 32.6 years
You gain X life, where X is twice the damage dealt to you so far this turn by artifacts.
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Cards similar to Reverse Polarity 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.
Emissary of Hope74%
$0.24↓#278410.05↓22.7 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life for each artifact that player controls."
Simulacrum70%
$0.35↑#17150↑0.24↓33.2 years
"You gain life equal to the damage dealt to you this turn. this card deals damage to target creature you control equal to the damage dealt to you this turn."