Sudden Impact 
Instant
$0.16 #19169 0.12 29.0 years
Sudden Impact deals damage to target player equal to the number of cards in that player's hand.
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Cards similar to Sudden Impact 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 Adamaro96%
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"this card deals damage to target player equal to the number of cards in that player's hand."
Runeflare Trap92%
$0.25↑#158750.1117.0 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Storm Seeker92%
$0.33↑#205760.00↓32.4 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Toil // Trouble86%
$0.10↓#198060.00↓13.5 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Viseling85%
$0.38↑#10726↑0.1326.7 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."
Iron Maiden84%
$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."
Black Vise82%
$0.47↑#11006↑0.31↑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."
Vicious Shadows82%
$1.96↑#11853↑0.30↑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."
Price of Knowledge80%
$2.07↑#12171↑0.31↑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."
Ebony Owl Netsuke80%
$2.07↑#13011↑0.0621.4 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."
Tibalt, the Fiend-Blooded79%
$0.61↑#178410.1314.5 years↓
"−4: this card deals damage equal to the number of cards in target player's hand to that player."
Misers' Cage78%
$1.51↑#198850.0630.0 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."
Balance of Power78%
$0.32↑#25165↓0.1929.5 years
"If target opponent has more cards in hand than you, draw cards equal to the difference."
Balor77%
$4.70↑#4478↑0.42↑4.4 years↓
"• This creature deals damage to target opponent equal to the number of cards in their hand."
Search Warrant76%
$0.17↑#189540.35↑14.0 years↓
"Target player reveals their hand. You gain life equal to the number of cards in that player's hand."
Bulwark74%
$0.43↑#26489↓0.33↑28.0 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."
Wolfcaller's Howl74%
$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."
Skullcage73%
$0.36↑#177670.31↑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."
Gerrard Capashen72%
$0.44↑#196350.2025.4 years↓
"At the beginning of your upkeep, you gain 1 life for each card in target opponent's hand."
Recurring Insight72%
$0.28↑#9861↑0.50↑16.5 years↓
"Draw cards equal to the number of cards in target opponent's hand."