Seaside Citadel

Seaside Citadel enters tapped.
{T}: Add {G}, {W}, or {U}.

Reflecting Pool

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

Sea of Clouds enters tapped unless you have two or more opponents.
{T}: Add {W} or {U}.

Dreamroot Cascade enters tapped unless you control two or more other lands.
{T}: Add {G} or {U}.

Sunpetal Grove enters tapped unless you control a Forest or a Plains.
{T}: Add {G} or {W}.

Bountiful Promenade enters tapped unless you have two or more opponents.
{T}: Add {G} or {W}.

{T}: Add one mana of any color that a land an opponent controls could produce.

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Overgrown Farmland enters tapped unless you control two or more other lands.
{T}: Add {G} or {W}.

({T}: Add {G} or {W}.)
Canopy Vista enters tapped unless you control two or more basic lands.

Rejuvenating Springs enters tapped unless you have two or more opponents.
{T}: Add {G} or {U}.

Deserted Beach enters tapped unless you control two or more other lands.
{T}: Add {W} or {U}.