20 cards where the card has the keyword “Mutate” and the color identity ≤ BGU

Archipelagore (Ikoria: Lair of Behemoths #41)
Auspicious Starrix (Ikoria: Lair of Behemoths #144)
Boneyard Lurker (Ikoria: Lair of Behemoths #178)
Brokkos, Apex of Forever (Ikoria: Lair of Behemoths #179)
Cavern Whisperer (Ikoria: Lair of Behemoths #79)
Chittering Harvester (Ikoria: Lair of Behemoths #80)
Dirge Bat (Ikoria: Lair of Behemoths #84)
Dreamtail Heron (Ikoria: Lair of Behemoths #47)
Gemrazer (Ikoria: Lair of Behemoths #155)
Glowstone Recluse (Ikoria: Lair of Behemoths #156)
Insatiable Hemophage (Ikoria: Lair of Behemoths #93)
Migratory Greathorn (Ikoria: Lair of Behemoths #165)
Mindleecher (Commander 2020 #44)
Otrimi, the Ever-Playful (Commander 2020 #12)
Parcelbeast (Ikoria: Lair of Behemoths #199)
Pouncing Shoreshark (Ikoria: Lair of Behemoths #64)
Sawtusk Demolisher (Commander 2020 #64)
Sea-Dasher Octopus (Ikoria: Lair of Behemoths #66)
Souvenir Snatcher (Commander 2020 #38)
Trumpeting Gnarr (Ikoria: Lair of Behemoths #213)

In the blink of an eye, they strode from deep snow to the end of this search.