Ebony Owl Netsuke 
Artifact
$2.07 #13011 0.06 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.
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Cards similar to Ebony Owl Netsuke 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 Maiden96%
$13.27↑#8308↑0.1127.7 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."
Viseling96%
$0.38↓#107260.1326.7 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."
Misers' Cage96%
$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."
Price of Knowledge92%
$2.07#121710.31↑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."
Skullcage92%
$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."
Black Vise91%
$0.47↓#110060.31↑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."
Fevered Visions87%
$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."
Dark Suspicions84%
$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 Seeker83%
$0.33↓#20576↓0.0032.4 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Gaze of Adamaro82%
$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."
Vicious Shadows82%
$1.96↓#118530.30↑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 Dragon81%
$0.33↓#9752↑0.0613.1 years↓
"When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."
Wolfcaller's Howl80%
$2.10↑#9964↑0.1512.0 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."
Lavaborn Muse80%
$0.15↓#23081↓0.40↑23.7 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."
Sudden Impact80%
$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."
Paupers' Cage79%
$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."
Hellfire Mongrel79%
$0.10↓#23164↓0.25↑17.0 years↓
"At the beginning of each opponent's upkeep, if that player has two or fewer cards in hand, this creature deals 2 damage to that player."
Wheel of Torture79%
$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."
Rackling79%
$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."
Storm World78%
$46.52↑#26625↓0.1232.4 years↑
"At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is 4 minus the number of cards in their hand."