19 cards where the illustration contains “galaxy-brain”

Brainstorm (Duel Decks: Izzet vs. Golgari #13)
Brainstorm (Strixhaven Mystical Archive #13)
Burning Vengeance (Innistrad #133)
Dismal Failure (Planar Chaos #39)
Doubtless One (Onslaught #27)
Elemental Resonance (Dissension #83)
Ignite Memories (Time Spiral #164)
Know Naught but Fire (Archenemy Schemes #23★)
Mindmoil (Ravnica: City of Guilds #135)
Mind Rot (Portal #101)
Mind's Desire (Judge Gift Cards 2008 #2)
Mind Unbound (Magic 2012 #68)
Omniscience (Wilds of Eldraine: Enchanting Tales #24)
Preordain (Doctor Who #218)
Shrapnel Blast (Friday Night Magic 2008 #12)
Sift (Ninth Edition #98)
Thought Collapse (Ravnica Allegiance #57)
Vanquish (Fifth Dawn #20)
Vengeful Rebirth (Alara Reborn #62)

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