36 cards where the card is tagged “random-discard”

Balor (Commander Legends: Battle for Baldur's Gate #162)
Black Cat (Jumpstart #203)
Bottomless Pit (Stronghold #51)
Cloak of Confusion (Masters Edition II #82)
Corrupt Official (Mercadian Masques #128)
Dementia Sliver (Time Spiral #236)
Elkin Lair (Visions #78)
Flay (Prophecy #65)
Greel, Mind Raker (Prophecy #66)
Gwendlyn Di Corci (Masters Edition III #149)
Headless Specter (Modern Horizons #95)
Hymn to Tourach (Eternal Masters #92)
Hypnotic Specter (Magic 2010 #100)
Insidious Bookworms (Alliances #51a)
Mind Knives (Portal #100)
Mind Shatter (Modern Masters 2017 #77)
Mind Twist (Masters Edition III #72)
Mindwhip Sliver (Tempest #145)
Nath of the Gilt-Leaf (Commander 2016 #213)
Nebuchadnezzar (Masters Edition III #162)
Rag Man (Seventh Edition #156)
Resounding Scream (Shards of Alara #83)
Rise // Fall (Duel Decks: Ajani vs. Nicol Bolas #73)
Rona, Herald of Invasion // Rona, Tolarian Obliterator (March of the Machine #75)
Rona, Herald of Invasion // Rona, Tolarian Obliterator (March of the Machine #75)
Sanity Gnawers (Alara Reborn #44)
Skullknocker Ogre (Throne of Eldraine #142)
Skull Rend (Return to Ravnica #195)
Skullscorch (Torment #114)
Specter's Wail (Mercadian Masques #164)
Stupor (Time Spiral Timeshifted #48)
Tourach, Dread Cantor (Modern Horizons 2 #102)
Tourach's Canticle (Modern Horizons 2 #103)
Urborg Mindsucker (Visions #71)
Urgoros, the Empty One (Dominaria #109)
Wand of Ith (The Dark #114)
Whispers of Emrakul (Eldritch Moon #114)

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