21 cards where the color identity is GRW and (the colors < GRW or the cards have hybrid mana) and the number of colors > 0

Cabaretti Initiate (Streets of New Capenna #137)
Cylian Sunsinger (Conflux #80)
Druid of the Anima (Shards of Alara #128)
Granger Guildmage (Mirage #220)
Huatli, Poet of Unity // Roar of the Fifth People (The Lost Caverns of Ixalan #189)
Huatli, Poet of Unity // Roar of the Fifth People (The Lost Caverns of Ixalan #189)
Jinnie Fay, Jetmir's Second (Streets of New Capenna #195)
Kaust, Eyes of the Glade (Murders at Karlov Manor Commander #1)
Marisi's Twinclaws (Duel Decks: Ajani vs. Nicol Bolas #17)
Mirrorwood Treefolk (Planeshift #83)
Nacatl Hunt-Pride (Duel Decks: Ajani vs. Nicol Bolas #20)
Naya Battlemage (Shards of Alara #142)
Naya Hushblade (Alara Reborn #141)
Resounding Roar (Shards of Alara #144)
Sacellum Archers (Conflux #89)
Samut, Voice of Dissent (Amonkhet #205)
Skyshroud Elf (Tempest Remastered #192)
Stone Kavu (Planeshift #93)
Thornscape Apprentice (Duel Decks: Phyrexia vs. the Coalition #37)
Thornscape Battlemage (Modern Masters 2017 #142)
Thornscape Master (Invasion #216)
Trace of Abundance (Alara Reborn #142)

Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list.