Sudden Impact 
Instant
$0.16 #18982 0.35 28.9 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 Trap93%
$0.19↑#156440.00↓16.9 years↓
"this card deals damage to target player equal to the number of cards in that player's hand."
Storm Seeker92%
$0.36↑#202950.3932.3 years↑
"this card deals damage to target player equal to the number of cards in that player's hand."
Viseling85%
$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 Maiden84%
$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 // Trouble83%
$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 Vise82%
$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 Shadows82%
$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 Knowledge80%
$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 Netsuke80%
$2.25↑#12919↑0.2921.3 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."
Tibalt, the Fiend-Blooded79%
$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."
Misers' Cage78%
$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."
Balor77%
$5.12↑#4342↑0.45↑4.2 years↓
"• This creature deals damage to target opponent equal to the number of cards in their hand."
Balance of Power77%
$0.32↑#24928↓0.05↓29.3 years
"If target opponent has more cards in hand than you, draw cards equal to the difference."
Search Warrant76%
$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."
Bulwark74%
$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."
Wolfcaller's Howl74%
$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."
Skullcage73%
$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."
Recurring Insight72%
$0.24↑#10089↑0.4116.4 years↓
"Draw cards equal to the number of cards in target opponent's hand."
Gerrard Capashen72%
$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."