Storm Seeker 
Instant
$0.36 #20295 0.39 32.3 years
Storm Seeker deals damage to target player equal to the number of cards in that player's hand.
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Cards similar to Storm Seeker 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.
Gaze of Adamaro93%
$0.23↓#202520.21↓21.3 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Sudden Impact92%
$0.16↓#189820.3528.9 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Runeflare Trap88%
$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."
Viseling88%
$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."
Iron Maiden88%
$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."
Toil // Trouble86%
$0.10↓#195190.07↓13.3 years↓
"Trouble deals damage to target player equal to the number of cards in that player's hand."
Black Vise86%
$0.43↑#10830↑0.4233.1 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."
Vicious Shadows85%
$1.95↑#11571↑0.59↑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."
Price of Knowledge84%
$2.28↑#12001↑0.3312.8 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."
Ebony Owl Netsuke83%
$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' Cage82%
$1.46↑#196550.3229.9 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."
Search Warrant80%
$0.16↓#188210.21↓13.9 years↓
"Target player reveals their hand. You gain life equal to the number of cards in that player's hand."
Balor80%
$5.12↑#4342↑0.454.2 years↓
"• This creature deals damage to target opponent equal to the number of cards in their hand."
Wolfcaller's Howl78%
$1.69↑#9949↑0.27↓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."
Skullcage76%
$0.36#173800.21↓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."
Bulwark76%
$0.43↑#26073↓0.57↑27.9 years↓
"At the beginning of your upkeep, this enchantment deals X damage to target opponent, where X is the number of cards in your hand minus the number of cards in that player's hand."
Tibalt, the Fiend-Blooded76%
$0.61↑#178470.65↑14.3 years↓
"−4: this card deals damage equal to the number of cards in target player's hand to that player."
Gerrard Capashen76%
$0.44↑#193370.00↓25.3 years↓
"At the beginning of your upkeep, you gain 1 life for each card in target opponent's hand."
Recurring Insight76%
$0.24↓#10089↑0.4116.4 years↓
"Draw cards equal to the number of cards in target opponent's hand."
Emberwilde Captain74%
$1.73↑#4037↑0.355.8 years↓
"Whenever an opponent attacks you while you're the monarch, this creature deals damage to that player equal to the number of cards in their hand."