Black Vise 
Artifact
$0.43 #10830 0.42 33.1 years
As this artifact enters, choose an opponent.
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.
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Cards similar to Black Vise 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.
Cursed Rack96%
$0.34↓#22151↓0.76↑32.5 years
"As this artifact enters, choose an opponent."
+1 more matching line
Iron Maiden94%
$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."
Viseling94%
$0.35↓#105960.53↑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."
Ebony Owl Netsuke91%
$2.25↑#129190.29↓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' Cage90%
$1.46↑#19655↓0.3229.9 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 Knowledge89%
$2.28↑#120010.3312.8 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."
The Rack88%
$0.39↓#16700↓0.3332.5 years
"As this artifact enters, choose an opponent."
+1 more matching line
Storm Seeker86%
$0.36↓#20295↓0.3932.3 years
"this card deals damage to target player equal to the number of cards in that player's hand."
Skullcage84%
$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."
Entropic Specter84%
$0.43#27167↓0.81↑28.2 years↓
"As this creature enters, choose an opponent."
Gaze of Adamaro84%
$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."
Vicious Shadows84%
$1.95↑#115710.59↑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."
Wolfcaller's Howl83%
$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."
Nyxathid82%
$0.35↓#15023↓0.25↓17.6 years↓
"As this creature enters, choose an opponent."
+1 more matching line
Sandstone Oracle82%
$0.16↓#4285↑0.06↓10.8 years↓
"When this creature enters, choose an opponent. If that player has more cards in hand than you, draw cards equal to the difference."
Sudden Impact82%
$0.16↓#18982↓0.3528.9 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Pallimud80%
$0.34↓#30464↓0.12↓28.9 years↓
"As this creature enters, choose an opponent."
Fevered Visions80%
$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."
Runeflare Trap80%
$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."
Energy Vortex78%
$0.80↑#28455↓0.13↓29.9 years↓
"As this enchantment enters, choose an opponent."
+1 more matching line