Spontaneous Generation

Sorcery

Sosuke's Summons

Sorcery

Spore Swarm

Instant

Rhonas's Last Stand

Sorcery

It of the Horrid Swarm

Creature — Eldrazi Insect

Hormagaunt Horde

Creature — Tyranid

Saproling Symbiosis

Sorcery

Last March of the Ents

Sorcery

Koma, Cosmos Serpent

Legendary Creature — Serpent

Skittering Invasion

Kindred Sorcery — Eldrazi

Snake Basket

Artifact

Fanatic of Rhonas

Creature — Snake Druid

Serpentine Curve

Sorcery

Neverending Torment

Sorcery

Arasta of the Endless Web

Legendary Enchantment Creature — Spider

Snake Pit

Enchantment

Crush of Wurms

Sorcery

Scute Swarm

Creature — Insect

Endless Wurm

Creature — Wurm

Then, Dreadmaws Ate Everyone

Sorcery

Bestial Menace

Sorcery

Rite of the Serpent

Sorcery

One Dozen Eyes

Sorcery

Endrek Sahr, Master Breeder

Legendary Creature — Human Wizard

Scouring Swarm

Creature — Insect

Swarmyard Massacre

Sorcery

Seed the Land

Enchantment

Champion of Wits

Creature — Snake Wizard

Gelatinous Genesis

Sorcery

Endless Foot Assault

Enchantment

Verdant Force

Creature — Elemental