Skullcage 
Artifact
$0.36 #17380 0.21 22.3 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%
$1.35↑#24679↓0.1229.9 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%
$0.12↓#22696↓0.33↑16.9 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%
$1.01↑#172400.06↓27.6 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%
$0.17↓#22627↓0.35↑23.6 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%
$0.22↓#23322↓0.00↓26.6 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%
$12.34↑#8331↑0.2027.6 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%
$1.46↑#196550.32↑29.9 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%
$0.35↓#10596↑0.53↑26.6 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%
$44.70↑#26198↓0.33↑32.3 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%
$2.25↑#12919↑0.2921.3 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%
$0.23↓#11778↑0.117.3 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%
$0.39↑#167000.33↑32.5 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%
$0.23↓#159040.173.4 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%
$2.28↑#12001↑0.33↑12.8 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%
$0.32↓#11187↑0.50↑13.9 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%
$0.43↑#10830↑0.42↑33.1 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%
$1.50↑#4437↑0.2310.4 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%
$0.27↓#26553↓0.58↑18.3 years↓
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Bandit's Talent80%
$0.41↑#4214↑0.55↑2.1 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%
$0.36#22357↓0.2625.6 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."