Skullcage 
Artifact
$0.36 #17767 0.31 22.4 years
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 similar to Skullcage 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.
Paupers' Cage96%
$1.30↑#25004↓0.4030.0 years↑
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this artifact deals 2 damage to that player."
Hellfire Mongrel95%
$0.10↓#23164↓0.2517.0 years↓
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to that player."
Wheel of Torture94%
$0.97↑#175630.56↑27.7 years↑
"At the beginning of each opponent's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand."
Lavaborn Muse94%
$0.15↓#23081↓0.4023.7 years↑
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 3 damage to that player."
Rackling94%
$0.21↓#23703↓0.2926.7 years↑
"At the beginning of each opponent's upkeep, this creature deals X damage to that player, where X is 3 minus the number of cards in their hand."
Iron Maiden93%
$13.27↑#8308↑0.11↓27.7 years↑
"At the beginning of each opponent's upkeep, this artifact deals X damage to that player, where X is the number of cards in their hand minus 4."
Misers' Cage93%
$1.51↑#198850.06↓30.0 years↑
"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."
Viseling92%
$0.38↑#10726↑0.13↓26.7 years↑
"At the beginning of each opponent's upkeep, this creature deals X damage to that player, where X is the number of cards in their hand minus 4."
Storm World92%
$46.52↑#26625↓0.12↓32.4 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is 4 minus the number of cards in their hand."
Ebony Owl Netsuke92%
$2.07↑#13011↑0.06↓21.4 years
"At the beginning of each opponent's upkeep, if that player has seven or more cards in hand, this artifact deals 4 damage to that player."
Davriel, Rogue Shadowmage90%
$0.19↓#11990↑0.50↑7.5 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, this card deals 2 damage to them."
The Rack90%
$0.44↑#168790.79↑32.6 years↑
"At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand."
Invasion of Eldraine // Prickle Faeries90%
$0.25↓#163680.42↑3.5 years↓
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to them."
Price of Knowledge86%
$2.07↑#12171↑0.3113.0 years↓
"At the beginning of each opponent's upkeep, this enchantment deals damage to that player equal to the number of cards in that player's hand."
Shrieking Affliction86%
$0.34↓#11239↑0.44↑14.0 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 3 life."
Black Vise84%
$0.47↑#11006↑0.3133.2 years↑
"At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is the number of cards in their hand minus 4."
Fevered Visions84%
$1.11↑#4522↑0.2210.5 years↓
"At the beginning of each player's end step, that player draws a card. If the player is your opponent and has four or more cards in hand, this enchantment deals 2 damage to that player."
Hollowborn Barghest81%
$0.31↓#26880↓0.13↓18.5 years↓
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Bandit's Talent80%
$0.36#4234↑0.402.2 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 2 life."
Dark Suspicions78%
$0.31↓#22784↓0.3025.7 years↑
"At the beginning of each opponent's upkeep, that player loses X life, where X is the number of cards in that player's hand minus the number of cards in your hand."