Black Vise 
Artifact
$0.47 #11006 0.31 33.2 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%
$0.35↓#22387↓1.00↑32.6 years
"As this artifact enters, choose an opponent."
+1 more matching line
Iron Maiden94%
$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."
Viseling94%
$0.38↓#107260.13↓26.7 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."
Ebony Owl Netsuke91%
$2.07↑#130110.06↓21.4 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' Cage90%
$1.51↑#19885↓0.06↓30.0 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."
Price of Knowledge89%
$2.07↑#121710.3113.0 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."
The Rack88%
$0.44↓#16879↓0.79↑32.6 years
"As this artifact enters, choose an opponent."
+1 more matching line
Storm Seeker86%
$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."
Skullcage84%
$0.36↓#17767↓0.3122.4 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."
Entropic Specter84%
$0.46↓#26832↓0.50↑28.3 years↓
"As this creature enters, choose an opponent."
Gaze of Adamaro84%
$0.21↓#20590↓0.05↓21.4 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Vicious Shadows84%
$1.96↑#118530.3018.0 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."
Wolfcaller's Howl83%
$2.10↑#99640.15↓12.0 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."
Nyxathid82%
$0.34↓#15194↓0.00↓17.7 years↓
"As this creature enters, choose an opponent."
+1 more matching line
Sandstone Oracle82%
$0.16↓#4134↑0.00↓10.9 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↓#19169↓0.12↓29.0 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Pallimud80%
$0.42↓#30810↓0.3629.0 years↓
"As this creature enters, choose an opponent."
Toil // Trouble80%
$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."
Fevered Visions80%
$1.11↑#4522↑0.2210.5 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."
Runeflare Trap79%
$0.25↓#15875↓0.11↓17.0 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."