Viseling 
Artifact Creature — Phyrexian Construct
$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.
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Cards similar to Viseling 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.
Iron Maiden100%
$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."
Price of Knowledge96%
$2.28↑#120010.33↓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↓0.29↓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' Cage94%
$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↑#108300.42↓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."
Skullcage92%
$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."
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."
Dark Suspicions88%
$0.36↑#22357↓0.26↓25.6 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."
Fevered Visions88%
$1.50↑#4437↑0.23↓10.4 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."
Gaze of Adamaro86%
$0.23↓#20252↓0.21↓21.3 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Stormbreath Dragon86%
$0.33↓#96780.21↓12.9 years↓
"When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."
Wolfcaller's Howl86%
$1.69↑#99490.27↓11.8 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."
Vicious Shadows86%
$1.95↑#115710.5917.9 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 Impact85%
$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."
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."
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."
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."
Lavaborn Muse81%
$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."
Toil // Trouble81%
$0.10↓#19519↓0.07↓13.3 years↓
"Trouble deals damage to target player equal to the number of cards in that player's hand."
Dreamborn Muse81%
$3.30↑#7538↑0.6223.6 years↓
"At the beginning of each player's upkeep, that player mills X cards, where X is the number of cards in their hand."