Forethought Amulet 
Artifact
At the beginning of your upkeep, sacrifice this artifact unless you pay {3}.
If an instant or sorcery source would deal 3 or more damage to you, it deals 2 damage to you instead.
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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.
Energy Flux 82%
#14693
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {2}.""