Storm World 
World Enchantment
$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.
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Cards similar to Storm World 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.
Rackling98%
$0.21↓#237030.29↑26.7 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."
Wheel of Torture98%
$0.97↓#17563↑0.56↑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 Muse96%
$0.15↓#230810.40↑23.7 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."
Hellfire Mongrel95%
$0.10↓#231640.25↑17.0 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."
Paupers' Cage95%
$1.30↓#250040.40↑30.0 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."
The Rack94%
$0.44↓#16879↑0.79↑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."
Skullcage92%
$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."
Davriel, Rogue Shadowmage92%
$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."
Invasion of Eldraine // Prickle Faeries90%
$0.25↓#16368↑0.42↑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."
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."
Bandit's Talent83%
$0.36↓#4234↑0.40↑2.2 years↓
"At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 2 life."
Hollowborn Barghest83%
$0.31↓#268800.1318.5 years↓
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Viseling80%
$0.38↓#10726↑0.1326.7 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."
Iron Maiden80%
$13.27↓#8308↑0.1127.7 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."
Ebony Owl Netsuke78%
$2.07↓#13011↑0.0621.4 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."
Nezumi Shortfang // Stabwhisker the Odious78%
$1.98↓#16670↑0.88↑22.1 years↓
"At the beginning of each opponent's upkeep, that player loses 1 life for each card fewer than three in their hand."
Misers' Cage78%
$1.51↓#19885↑0.0630.0 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."
Sulfuric Vortex77%
$0.86↓#2865↑0.71↑23.4 years↓
"At the beginning of each player's upkeep, this enchantment deals 2 damage to that player."
Price of Knowledge76%
$2.07↓#12171↑0.31↑13.0 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."
Copper Tablet74%
$56.19↑#15887↑0.25↑33.2 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."