Copper Tablet 
Artifact
$56.45 #15363 0.11 33.1 years
At the beginning of each player's upkeep, this artifact deals 1 damage to that player.
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Cards similar to Copper Tablet 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.
Rumbling Slum97%
$0.25↓#26639↓0.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Barbed Wire96%
$1.77↓#134580.40↑26.9 years↓
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Mask of Intolerance93%
$0.28↓#30292↓0.50↑25.3 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."
Impatience91%
$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."
Power Surge91%
$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."
Roiling Vortex90%
$1.96↓#2476↑0.45↑5.9 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."
Rivalry90%
$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."
Razor Pendulum90%
$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."
Antagonism90%
$0.41↓#25473↓0.1027.9 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."
Spear Spewer90%
$0.20↓#5043↑0.197.6 years↓
"
: This creature deals 1 damage to each player."
: This creature deals 1 damage to each player."
Flame Rift90%
$0.32↓#3984↑0.2026.6 years↓
"this card deals 4 damage to each player."
Furnace Punisher90%
$0.07↓#21158↓0.50↑3.6 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."
Plague Spitter88%
$0.45↓#7520↑0.33↑25.9 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each creature and each player."
Citadel of Pain88%
$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."
Festering Evil87%
$0.24↓#23474↓0.0729.2 years↓
"At the beginning of your upkeep, this enchantment deals 1 damage to each creature and each player."
Lim-Dûl's Hex86%
$0.51↓#173390.1931.3 years↓
"At the beginning of your upkeep, for each player, this enchantment deals 1 damage to that player unless they pay 
or 
."
or ."
Sulfuric Vortex86%
$0.88↓#2762↑0.63↑23.3 years↓
"At the beginning of each player's upkeep, this enchantment deals 2 damage to that player."
Ancient Runes84%
$1.40↓#144670.35↑28.9 years↓
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of artifacts they control."
Primal Order84%
$2.09↓#157940.44↑30.9 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."
Pestilence Demon83%
$0.53↓#10118↑0.47↑16.4 years↓
": This creature deals 1 damage to each creature and each player."
: This creature deals 1 damage to each creature and each player."