Iron Maiden 
Artifact
$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.
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Cards similar to Iron Maiden 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.
Viseling100%
$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."
Price of Knowledge96%
$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."
Ebony Owl Netsuke96%
$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."
Misers' Cage95%
$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."
Black Vise94%
$0.47↓#11006↓0.31↑33.2 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."
Skullcage93%
$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."
Dark Suspicions88%
$0.31↓#22784↓0.30↑25.7 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."
Storm Seeker88%
$0.33↓#20576↓0.00↓32.4 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Fevered Visions88%
$1.11↓#4522↑0.22↑10.5 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."
Gaze of Adamaro86%
$0.21↓#20590↓0.0521.4 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Wolfcaller's Howl86%
$2.10↓#99640.1512.0 years↓
"At the beginning of your upkeep, create X 2/2 green Wolf creature tokens, where X is the number of your opponents with four or more cards in hand."
Vicious Shadows86%
$1.96↓#11853↓0.30↑18.0 years↓
"Whenever a creature dies, you may have this enchantment deal damage to target player equal to the number of cards in that player's hand."
Stormbreath Dragon85%
$0.33↓#97520.0613.1 years↓
"When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."
Sudden Impact84%
$0.16↓#19169↓0.1229.0 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Toil // Trouble83%
$0.10↓#19806↓0.00↓13.5 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Wheel of Torture82%
$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."
Rackling82%
$0.21↓#23703↓0.29↑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."
Runeflare Trap81%
$0.25↓#15875↓0.1117.0 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Dreamborn Muse81%
$3.21↓#78110.68↑23.7 years↓
"At the beginning of each player's upkeep, that player mills X cards, where X is the number of cards in their hand."
Paupers' Cage80%
$1.30↓#25004↓0.40↑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."