Necrogen Mists {2}{B}
Enchantment
At the beginning of each player's upkeep, that player discards a card.
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Cards that do something similar 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.
Bottomless Pit 98%
$7.95#5514
"At the beginning of each player's upkeep, that player discards a card at random."
Enemy of Enlightenment 96%
$0.08#25476
"At the beginning of your upkeep, each player discards a card."
Syphon Mind 83%
#1063
"Each other player discards a card. You draw a card for each card discarded this way."
Lim-Dûl's Paladin 82%
$0.26#28541
"At the beginning of your upkeep, you may discard a card. If you don't, sacrifice this creature and draw a card."
Lorehold, the Historian 82%
$1.93#8275
"At the beginning of each opponent's upkeep, you may discard a card. If you do, draw a card."