48 cards where the illustration contains “upside-down”

Acquisition Octopus (Kamigawa: Neon Dynasty #44)
Acquisitions Expert (Zendikar Rising #89)
Adaptive Shimmerer (Ikoria: Lair of Behemoths #1)
Aether Gust (Core Set 2020 #42)
Air-Cult Elemental (Adventures in the Forgotten Realms #45)
Arvinox, the Mind Flail (Secret Lair Drop #340)
Assassinate (Time Spiral #95)
Blight Keeper (Ixalan #92)
Blood Artist (Avacyn Restored #86)
Bloodthirsty Aerialist (Core Set 2020 #91)
Chemister's Insight (Guilds of Ravnica #32)
Crafty Cutpurse (Rivals of Ixalan #33)
Crop Rotation (Duel Decks: Nissa vs. Ob Nixilis #7)
Deathmark (Magic 2010 #90)
Discord, Lord of Disharmony (Secret Lair Drop #798)
Distorting Wake (Invasion #52)
Earthblighter (Legions #68)
Fiery Fall (Conflux #63)
Firespout (Shadowmoor #205)
Flame Burst (Odyssey #194)
Gigantomancer (Rise of the Eldrazi #184)
Golgari Guildgate (Guilds of Ravnica #248)
Go-Shintai of Lost Wisdom (Kamigawa: Neon Dynasty #55)
Guerrilla Tactics (Eighth Edition #192)
Hive Stirrings (Magic 2014 #21)
Ingenious Infiltrator (Modern Horizons #204)
Jeskai Sage (Fate Reforged #38)
Karma (Limited Edition Alpha #26)
Kitesail Corsair (Rivals of Ixalan #41)
Kotose, the Silent Spider (Kamigawa: Neon Dynasty #351)
Lightning Bolt (Magic Player Rewards 2010 #1)
Lost in the Woods (Dark Ascension #123)
Necropotence (From the Vault: Exiled #9)
Negate (Signature Spellbook: Jace #7)
Painful Truths (Battle for Zendikar #120)
Paralyzing Grasp (Zendikar #58)
Plummet (Archenemy #65)
Precise Strike (Aether Revolt #92)
Rambunctious Mutt (Core Set 2021 #30)
Rhystic Deluge (Prophecy #43)
Robber of the Rich (Throne of Eldraine #138)
Shardless Agent (Planechase 2012 #104)
Subtle Strike (Kaladesh #100)
Topsy Turvy (Unhinged #47)
Treespring Lorian (Onslaught #293)
Tricks of the Trade (Magic 2013 #74)
Unlucky Drop (The Lost Caverns of Ixalan #82)
Vampirism (Multiverse Gift Box #6)

The message was clear to Sorin—time to search for something else.