21 cards where (the card types include “creature” and the card types include “legendary”) and the colors is GRU and (the card is available on Paper) and the card is the first printing

Riku of Many Paths (Outlaws of Thunder Junction #227)
Loot, the Key to Everything (The Big Score #21)
Lara Croft, Tomb Raider (Secret Lair Drop #1501)
Me, the Immortal (Doctor Who #147)
Beluna Grandsquall // Seek Thrills (Wilds of Eldraine #220)
Borborygmos and Fblthp (March of the Machine #219)
Rashmi and Ragavan (March of the Machine Commander #8)
Gimbal, Gremlin Prodigy (March of the Machine Commander #3)
Magus Lucea Kane (Warhammer 40,000 Commander #7)
The Swarmlord (Warhammer 40,000 Commander #4)
Miirym, Sentinel Wyrm (Commander Legends: Battle for Baldur's Gate #284)
Averna, the Chaos Bloom (Commander Legends #269)
Illuna, Apex of Wishes (Ikoria: Lair of Behemoths #190)
Xyris, the Writhing Storm (Commander 2020 #18)
Kalamax, the Stormsire (Commander 2020 #9)
Omnath, Locus of the Roil (Core Set 2020 #216)
Surrak Dragonclaw (Khans of Tarkir #206)
Maelstrom Wanderer (Planechase 2012 #101)
Riku of Two Reflections (Commander 2011 #220)
Animar, Soul of Elements (Commander 2011 #181)
Intet, the Dreamer (Planar Chaos #158)

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