Skullcage {4}
Artifact
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.
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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.
Misers' Cage 98%
$1.73#19428
"At the beginning of each opponent's upkeep, if that player has five or more cards in hand, this artifact deals 2 damage to that player."
Barbed Wire 83%
$1.94#13262
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Copper Tablet 83%
#15293
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."