Sire of Insanity 
Creature — Demon
$0.48 #8796 1.58 13.3 years
At the beginning of each end step, each player discards their hand.
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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.
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"At the beginning of your upkeep, each player discards a card."
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"When this creature enters, each player discards a card."
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"When this creature enters, each player discards a card."
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"At the beginning of your upkeep, each player discards a card."
Earsplitting Rats88%
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"When this creature enters, each player discards a card."
Rix Maadi, Dungeon Palace87%
$0.26↓#98650.33↓20.3 years↑
"
, 
: Each player discards a card. Activate only as a sorcery."
, : Each player discards a card. Activate only as a sorcery."
Mindslicer87%
$0.42↓#5709↑1.28↓24.9 years↑
"When this creature dies, each player discards their hand."
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"Each player discards three cards."
Awaken the Erstwhile84%
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"Each player discards all the cards in their hand, then creates that many 2/2 black Zombie creature tokens."
Serum Raker80%
$0.03↓#30908↓0.50↓15.6 years↑
"When this creature dies, each player discards a card."
Necrogen Mists80%
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"At the beginning of each player's upkeep, that player discards a card."
Rankle's Prank80%
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"• Each player discards two cards."
Liliana, Heretical Healer // Liliana, Defiant Necromancer78%
$6.59↑#4489↑0.45↓11.2 years↓
"+2: Each player discards a card."
Stronghold Rats78%
$0.66↑#76280.37↓19.3 years↑
"Whenever this creature deals combat damage to a player, each player discards a card."
Creeping Dread78%
$0.28↓#14286↓0.52↓10.4 years↓
"At the beginning of your upkeep, each player discards a card. Each opponent who discarded a card that shares a card type with the card you discarded loses 3 life."
Kardur's Vicious Return78%
$0.24↓#18362↓0.50↓5.6 years↓
"Each player discards a card."
Bottomless Pit78%
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"At the beginning of each player's upkeep, that player discards a card at random."
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"When this creature enters, each player discards a card."
Mind Rake78%
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"Target player discards two cards."
Liliana of the Veil76%
$4.51↑#2965↑0.85↓14.9 years↑
"+1: Each player discards a card."