Morphic Pool

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

Watery Grave

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

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

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

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

As an additional cost to cast this spell, sacrifice a creature.
Search your library for a card, put that card into your hand, then shuffle.

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