Mask of Intolerance 
Artifact
$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.
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Cards similar to Mask of Intolerance 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.
Copper Tablet93%
$56.45↑#15363↑0.11↓33.1 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Power Surge93%
$1.11↑#11497↑0.4333.1 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."
Rivalry90%
$0.38↑#255460.32↓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."
Barbed Wire90%
$1.77↑#13458↑0.4026.9 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Rumbling Slum90%
$0.25↓#266390.79↑20.6 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each player."
Primal Order89%
$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."
Citadel of Pain89%
$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."
Furnace Punisher88%
$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."
Collapsing Borders88%
$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."
Price of Progress86%
$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."
Flame Rift86%
$0.32↑#3984↑0.20↓26.6 years↑
"this card deals 4 damage to each player."
Antagonism86%
$0.41↑#254730.10↓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."
Impatience85%
$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."
Roiling Vortex84%
$1.96↑#2476↑0.455.9 years↓
"At the beginning of each player's upkeep, this enchantment deals 1 damage to them."
Razor Pendulum84%
$0.53↑#301860.24↓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."
Acidic Soil83%
$0.49↑#8031↑0.73↑27.9 years↑
"this card deals damage to each player equal to the number of lands they control."
Spear Spewer82%
$0.20↓#5043↑0.19↓7.6 years↓
"
: This creature deals 1 damage to each player."
: This creature deals 1 damage to each player."
Cold Snap82%
$0.19↓#312670.25↓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."
Ancient Runes82%
$1.40↑#14467↑0.35↓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."
Karma81%
$0.19↓#19063↑0.63↑33.1 years↑
"At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control."