Slimefoot, Thallid Transplant

Whenever a Swamp or Forest enters under your control, draft a card from Slimefoot, Thallid Transplant's spellbook.

Alchemy: Dominaria

Thallids nurture saprolings, entertain them, and eat them.

Fungal Plots

{1}{G}, Exile a creature card from your graveyard: Create a 1/1 green Saproling creature token.
Sacrifice two Saprolings: You gain 2 life and draw a card.

Thallids herd saprolings from place to place in search of detritus to feed them.

Saproling Migration

Kicker {4} (You may pay an additional {4} as you cast this spell.)
Create two 1/1 green Saproling creature tokens. If this spell was kicked, create four of those tokens instead.

"Remember to come back in a few years when that fungus has died off. Then we'll see what's in the chest."
—Old Rutstein

Spore Crawler

As the irrepressible power of a dormant Multani courses through Yavimaya, the forest passes judgment on travelers and natives alike. Only the fungus prospers.

Spore Swarm

Create three 1/1 green Saproling creature tokens.

"The identifying ornamental growths of alpha thallids may be hereditary, or catalyzed by some chemical signal."
—*Sarpadian Empires, vol. III*

Sporecrown Thallid

Each other creature you control that's a Fungus or Saproling gets +1/+1.

"If you threaten its territory, it produces spores. Actually, no matter what you do, it produces spores."
—Hadi Kasten, Calla Dale naturalist

Sporemound

Landfall — Whenever a land you control enters, create a 1/1 green Saproling creature token.

Verdant Embrace

Enchant creature
Enchanted creature gets +3/+3 and has "At the beginning of each upkeep, create a 1/1 green Saproling creature token."

Left to itself, nature overflows any container, overthrows any restriction, and overreaches any boundary.

Verdant Force

At the beginning of each upkeep, create a 1/1 green Saproling creature token.

"Nature is not always gentle or kind, but all life begets life."
—Marwyn of Llanowar

Deathbloom Thallid

When Deathbloom Thallid dies, create a 1/1 green Saproling creature token.

Swarm Shambler

Swarm Shambler enters the battlefield with a +1/+1 counter on it.
Whenever a creature you control with a +1/+1 counter on it becomes the target of a spell an opponent controls, create a 1/1 green Insect creature token.
{1}, {T}: Put a +1/+1 counter on Swarm Shambler.

Swarm Shambler enters with a +1/+1 counter on it.
Whenever a creature you control with a +1/+1 counter on it becomes the target of a spell an opponent controls, create a 1/1 green Insect creature token.
{1}, {T}: Put a +1/+1 counter on Swarm Shambler.

Deathbonnet Sprout // Deathbonnet Hulk

At the beginning of your upkeep, mill a card. Then if there are three or more creature cards in your graveyard, transform Deathbonnet Sprout. (To mill a card, put the top card of your library into your graveyard.)

Thelon of Havenwood created thallids as a food source in times of darkness. Thallids did the same with saprolings.

Thallid Omnivore

{1}, Sacrifice another creature: Thallid Omnivore gets +2/+2 until end of turn. If a Saproling was sacrificed this way, you gain 2 life.

"When their community grows cluttered, thallids begin a traditional bobbing dance, then trek out in all directions."
—*Sarpadian Empires, vol. III*

Yavimaya Sapherd

When Yavimaya Sapherd enters, create a 1/1 green Saproling creature token.

"The dead gain new purpose here. What is strange in the eyes of other guilds is harmonious in ours."
—Devesh, Golgari shaman

Rhizome Lurcher

Undergrowth — Rhizome Lurcher enters the battlefield with a number of +1/+1 counters on it equal to the number of creature cards in your graveyard.

Undergrowth — Rhizome Lurcher enters with a number of +1/+1 counters on it equal to the number of creature cards in your graveyard.

Some of the thallids that escaped into the fens of Urborg began emulating the Cabal's bloodsoaked rituals in their own peculiar way.