Ebony Owl Netsuke 
Artifact
$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.
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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%
$12.34↑#8331↑0.2027.6 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."
Viseling96%
$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."
Misers' Cage96%
$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 Knowledge92%
$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."
Skullcage92%
$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."
Black Vise91%
$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."
Fevered Visions87%
$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."
Dark Suspicions84%
$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 Seeker83%
$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."
Stormbreath Dragon82%
$0.33↓#9678↑0.2112.9 years↓
"When this creature becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."
Gaze of Adamaro82%
$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."
Vicious Shadows82%
$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."
Lavaborn Muse80%
$0.17↓#22627↓0.3523.6 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."
Wolfcaller's Howl80%
$1.69↓#9949↑0.2711.8 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."
Sudden Impact80%
$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."
Paupers' Cage80%
$1.35↓#24679↓0.12↓29.9 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."
Hellfire Mongrel80%
$0.12↓#22696↓0.3316.9 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%
$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."
Rackling79%
$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."
Storm World78%
$44.70↑#26198↓0.3332.3 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."