Sea of Clouds

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

Vault of Champions

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

({T}: Add {R} or {G}.)
As Stomping Ground enters, you may pay 2 life. If you don't, it enters tapped.

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

({T}: Add {G} or {W}.)
As Temple Garden enters, you may pay 2 life. If you don't, it enters tapped.

({T}: Add {W} or {U}.)
As Hallowed Fountain enters, you may pay 2 life. If you don't, it enters tapped.

Spectator Seating enters tapped unless you have two or more opponents.
{T}: Add {R} or {W}.

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

({T}: Add {G} or {U}.)
As Breeding Pool enters, you may pay 2 life. If you don't, it enters tapped.

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

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

({T}: Add {B} or {R}.)
As Blood Crypt enters, you may pay 2 life. If you don't, it enters tapped.

Spire Garden enters tapped unless you have two or more opponents.
{T}: Add {R} or {G}.

({T}: Add {W} or {B}.)
As Godless Shrine enters, you may pay 2 life. If you don't, it enters tapped.

Luxury Suite enters tapped unless you have two or more opponents.
{T}: Add {B} or {R}.

({T}: Add {B} or {G}.)
As Overgrown Tomb enters, you may pay 2 life. If you don't, it enters tapped.

Training Center enters tapped unless you have two or more opponents.
{T}: Add {U} or {R}.

({T}: Add {R} or {W}.)
As Sacred Foundry enters, you may pay 2 life. If you don't, it enters tapped.

({T}: Add {U} or {R}.)
As Steam Vents enters, you may pay 2 life. If you don't, it enters tapped.

({T}: Add {U} or {B}.)
As Watery Grave enters, you may pay 2 life. If you don't, it enters tapped.