Power Surge 
Enchantment
$1.11 #11497 0.43 33.1 years
At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.
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Cards similar to Power Surge 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.
Citadel of Pain96%
$4.17↑#6667↑1.11↑26.3 years↓
"At the beginning of each player's end step, this enchantment deals X damage to that player, where X is the number of untapped lands they control."
Mask of Intolerance93%
$0.28↓#30292↓0.5025.3 years↓
"At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, this artifact deals 3 damage to that player."
Copper Tablet91%
$56.45↑#15363↓0.11↓33.1 years
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Primal Order88%
$2.09↑#15794↓0.4430.9 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of nonbasic lands they control."
Rivalry88%
$0.38↓#25546↓0.32↓27.6 years↓
"At the beginning of each player's upkeep, if that player controls more lands than each other player, this enchantment deals 2 damage to them."
Rumbling Slum88%
$0.25↓#26639↓0.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Barbed Wire88%
$1.77↑#134580.4026.9 years↓
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Acidic Soil87%
$0.49↓#8031↑0.73↑27.9 years↓
"this card deals damage to each player equal to the number of lands they control."
Ancient Runes86%
$1.40↑#14467↓0.3528.9 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of artifacts they control."
Collapsing Borders86%
$0.34↓#24000↓0.19↓25.9 years↓
"At the beginning of each player's upkeep, that player gains 1 life for each basic land type among lands they control. Then this enchantment deals 3 damage to that player."
Furnace Punisher85%
$0.07↓#21158↓0.503.6 years↓
"At the beginning of each player's upkeep, this creature deals 2 damage to that player unless they control two or more basic lands."
Kratos, God of War85%
$48.29↑#6195↑0.00↓0.9 years↓
"At the beginning of each player's end step, this card deals damage to that player equal to the number of creatures that player controls that didn't attack this turn."
Antagonism85%
$0.41↓#25473↓0.10↓27.9 years↓
"At the beginning of each player's end step, this enchantment deals 2 damage to that player unless one of their opponents was dealt damage this turn."
Angel's Trumpet84%
$0.50↓#8723↑0.5227.6 years↓
"At the beginning of each player's end step, tap all untapped creatures that player controls that didn't attack this turn. This artifact deals damage to the player equal to the number of creatures tapped this way."
Price of Progress84%
$4.26↑#2810↑0.70↑28.2 years↓
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."
Cold Snap84%
$0.19↓#31267↓0.25↓31.3 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of snow lands they control."
Impatience84%
$0.29↓#22786↓0.31↓27.2 years↓
"At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player."
Flame Rift84%
$0.32↓#3984↑0.20↓26.6 years↓
"this card deals 4 damage to each player."
Razor Pendulum82%
$0.53↓#30186↓0.24↓29.9 years↓
"At the beginning of each player's end step, if that player has 5 or less life, this artifact deals 2 damage to that player."
Roiling Vortex82%
$1.96↑#2476↑0.455.9 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."