Startling Development

Instant

Snakeform

Instant

Mercurial Transformation

Sorcery — Lesson

Turn to Frog

Instant

Polymorphist's Jest

Instant

Sea Kings' Blessing

Instant

Cerulean Wisps

Instant

Iceridge Serpent

Creature — Serpent

Dance of the Skywise

Instant

Mordenkainen's Polymorph

Instant

Wormhole Serpent

Creature — Serpent

Rite of the Serpent

Sorcery

Quickchange

Instant

Sliptide Serpent

Creature — Serpent

Frilled Sea Serpent

Creature — Serpent

Kukemssa Serpent

Creature — Serpent

Floodtide Serpent

Creature — Serpent

Sea Snidd

Creature — Beast

Koma, Cosmos Serpent

Legendary Creature — Serpent

Phantasmal Form

Instant

Sword Coast Serpent // Capsizing Wave

Creature — Serpent Dragon // Instant — Adventure

Shrouded Serpent

Creature — Serpent

Sway of Illusion

Instant

Serendib Sorcerer

Creature — Human Wizard Sorcerer

Feed the Serpent

Instant

Suit Up

Instant

Kaseto, Orochi Archmage

Legendary Creature — Snake Wizard

Snake Pit

Enchantment

Veiled Serpent

Enchantment

Riptide Mangler

Creature — Beast

Denizen of the Deep

Creature — Serpent