Underground Sea

Blood Crypt

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

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

{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.

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

{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

This land enters tapped.
{T}: Add {U}, {B}, or {R}.

({T}: Add {U}, {B}, or {R}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.

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

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

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

{T}: Add one mana of any color in your commander's color identity.

This land enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.

This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

{T}, Pay 1 life, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield, then shuffle.

{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.