Rackling 
Artifact Creature — Phyrexian Construct
$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.
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Cards similar to Rackling 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.
Wheel of Torture99%
$1.01↑#17240↑0.0627.6 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."
Storm World98%
$44.70↑#261980.33↑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."
Lavaborn Muse98%
$0.17↓#226270.35↑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."
Hellfire Mongrel97%
$0.12↓#226960.33↑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."
Paupers' Cage96%
$1.35↑#246790.12↑29.9 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."
The Rack94%
$0.39↑#16700↑0.33↑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."
Skullcage94%
$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."
Davriel, Rogue Shadowmage93%
$0.23↑#11778↑0.11↑7.3 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."
Invasion of Eldraine // Prickle Faeries92%
$0.23↑#15904↑0.17↑3.4 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."
Shrieking Affliction89%
$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."
Bandit's Talent86%
$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."
Hollowborn Barghest86%
$0.27↑#265530.58↑18.3 years↓
"At the beginning of each opponent's upkeep, if that player has no cards in hand, they lose 2 life."
Viseling82%
$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."
Iron Maiden82%
$12.34↑#8331↑0.20↑27.6 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."
Nezumi Shortfang // Stabwhisker the Odious82%
$2.19↑#16336↑0.27↑21.9 years↓
"At the beginning of each opponent's upkeep, that player loses 1 life for each card fewer than three in their hand."
Ebony Owl Netsuke79%
$2.25↑#12919↑0.29↑21.3 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."
Misers' Cage78%
$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."
Price of Knowledge78%
$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."
Quest for the Nihil Stone76%
$1.69↑#10408↑0.29↑16.6 years↓
"At the beginning of each opponent's upkeep, if that player has no cards in hand and this enchantment has two or more quest counters on it, you may have that player lose 5 life."
Bulwark76%
$0.43↑#260730.57↑27.9 years↑
"At the beginning of your upkeep, this enchantment deals X damage to target opponent, where X is the number of cards in your hand minus the number of cards in that player's hand."