Hallowed Fountain

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

Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

This land enters tapped unless you control two or fewer other lands.
{T}: Add {W} or {U}.

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

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

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

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

This land enters tapped unless you control two or more other lands.
{T}: Add {U} or {B}.

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

This land enters tapped unless you control two or fewer other lands.
{T}: Add {W} or {B}.

This land enters tapped unless you control two or fewer other lands.
{T}: Add {U} or {B}.

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