Sire of Insanity 
Creature — Demon
$0.49 #9050 1.70 13.5 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%
$0.18↓#22059↓0.21↓24.4 years↑
"When this creature enters, each player discards a card."
Rix Maadi, Dungeon Palace87%
$0.24↓#100940.22↓20.5 years↑
"
, 
: Each player discards a card. Activate only as a sorcery."
, : Each player discards a card. Activate only as a sorcery."
Mindslicer87%
$0.44↓#5722↑1.36↓25.1 years↑
"When this creature dies, each player discards their hand."
Delirium Skeins86%
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"Each player discards three cards."
Awaken the Erstwhile84%
$0.35↓#93130.95↓7.7 years↓
"Each player discards all the cards in their hand, then creates that many 2/2 black Zombie creature tokens."
Serum Raker81%
$0.03↓#31119↓0.18↓15.7 years↑
"When this creature dies, each player discards a card."
Necrogen Mists80%
$4.87↑#6249↑1.22↓23.0 years↑
"At the beginning of each player's upkeep, that player discards a card."
Rankle's Prank80%
$0.39↓#6833↑1.06↓3.1 years↓
"• Each player discards two cards."
Stronghold Rats78%
$0.47↓#76610.47↓19.5 years↑
"Whenever this creature deals combat damage to a player, each player discards a card."
Creeping Dread78%
$0.18↓#14434↓0.30↓10.5 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%
$0.23↓#18644↓0.09↓5.7 years↓
"Each player discards a card."
Bottomless Pit78%
$5.55↑#5413↑1.30↓28.6 years↑
"At the beginning of each player's upkeep, that player discards a card at random."
Rotting Rats78%
$0.76↑#86270.53↓17.7 years↑
"When this creature enters, each player discards a card."
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"When this creature enters, each player discards a card."
Mind Rake77%
$0.23↓#84320.33↓7.4 years↓
"Target player discards two cards."
Liliana, Heretical Healer // Liliana, Defiant Necromancer76%
$6.65↑#4521↑0.12↓11.3 years↓
"+2: Each player discards a card."