Iron Maiden 
Artifact
$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.
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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%
$0.35↓#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."
Price of Knowledge96%
$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."
Ebony Owl Netsuke96%
$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."
Misers' Cage95%
$1.46↓#19655↓0.32↑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."
Black Vise94%
$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."
Skullcage93%
$0.36↓#17380↓0.2122.3 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."
Dark Suspicions88%
$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."
Storm Seeker88%
$0.36↓#20295↓0.39↑32.3 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Fevered Visions88%
$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."
Wolfcaller's Howl86%
$1.69↓#99490.2711.8 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."
Gaze of Adamaro86%
$0.23↓#20252↓0.2121.3 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Stormbreath Dragon86%
$0.33↓#96780.2112.9 years↓
"When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."
Vicious Shadows86%
$1.95↓#11571↓0.59↑17.9 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."
Sudden Impact84%
$0.16↓#18982↓0.35↑28.9 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Wheel of Torture82%
$1.01↓#17240↓0.06↓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."
Rackling82%
$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."
Runeflare Trap82%
$0.19↓#15644↓0.00↓16.9 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Dreamborn Muse81%
$3.30↓#75380.62↑23.6 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%
$1.35↓#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."
Lavaborn Muse80%
$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."