Bayou

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Swamp

Hidden Horror

When Hidden Horror enters, sacrifice it unless you discard a creature card.

Harvest Wurm

When Harvest Wurm enters, sacrifice it unless you return a basic land card from your graveyard to your hand.

Island

Harrow

As an additional cost to cast this spell, sacrifice a land.
Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Merfolk Traders

When Merfolk Traders enters, draw a card, then discard a card.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

Recurring Nightmare

Sacrifice a creature, Return Recurring Nightmare to its owner's hand: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

Reflecting Pool

{T}: Add one mana of any type that a land you control could produce.

Wall of Blossoms

Defender
When Wall of Blossoms enters, draw a card.

Forest

Death's Duet

Return two target creature cards from your graveyard to your hand.

Gemstone Mine

Gemstone Mine enters with three mining counters on it.
{T}, Remove a mining counter from Gemstone Mine: Add one mana of any color. If there are no mining counters on Gemstone Mine, sacrifice it.

Rampant Growth

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Tortured Existence

{B}, Discard a creature card: Return target creature card from your graveyard to your hand.

Underground Sea

Llanowar Sentinel

When Llanowar Sentinel enters, you may pay {1}{G}. If you do, search your library for a card named Llanowar Sentinel, put that card onto the battlefield, then shuffle.