27 cards where the text includes “discards their hand”

Brink of Madness (Urza's Legacy #50)
Chandra Ablaze (Zendikar #120)
Curse of Obsession (Midnight Hunt Commander #35)
Dragon Mage (Core Set 2020 #135)
Farewell to Arms (Unhinged #56)
Ill-Gotten Gains (Conspiracy #114)
Jace's Archivist (Commander 2015 #95)
Juggle the Performance (Alchemy: Murders at Karlov Manor #25)
Magus of the Jar (Time Spiral #67)
Magus of the Wheel (Commander Masters #241)
Memory Jar (Vintage Masters #276)
Mindslicer (Dominaria Remastered #91)
Myojin of Night's Reach (Champions of Kamigawa #126)
Nicol Bolas (Masters 25 #209)
Perplex (Ravnica: City of Guilds #217)
Reforge the Soul (Commander 2016 #132)
Runehorn Hellkite (Commander 2016 #20)
Sensation Gorger (Morningtide #102)
Sire of Insanity (Dragon's Maze #104)
Strategy, Schmategy (Unsanctioned #58)
Tyrannize (Shadowmoor #201)
Wheel of Fate (Time Spiral Remastered #198)
Wheel of Fortune (Vintage Masters #192)
Wheel of Misfortune (Commander Legends #211)
Whispering Madness (Commander 2016 #229)
Windfall (Outlaws of Thunder Junction Commander #123)
Wit's End (Magic 2013 #117)

Though this query has ended, its relics still slumber in New Argive.