Barbed Wire {3}
Artifact
At the beginning of each player's upkeep, this artifact deals 1 damage to that player.
{2}: Prevent the next 1 damage that would be dealt by this artifact 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.
Copper Tablet 100%
#15293
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Circle of Protection: Artifacts 85%
$0.23#25901
"{2}: The next time an artifact source of your choice would deal damage to you this turn, prevent that damage."
Skullcage 83%
$0.37#17141
"At the beginning of each opponent's upkeep, this artifact deals 2 damage to that player unless they have exactly three or exactly four cards in hand."
Shield of the Ages 83%
#30127
"{2}: Prevent the next 1 damage that would be dealt to you this turn."