Undergrowth Stadium

Undergrowth Stadium enters tapped unless you have two or more opponents.
{T}: Add {B} or {G}.

Morphic Pool

Morphic Pool enters tapped unless you have two or more opponents.
{T}: Add {U} or {B}.

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

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

Vault of Champions enters tapped unless you have two or more opponents.
{T}: Add {W} or {B}.