Marsh Flats

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

Scrubland

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

{T}: Add {G}.
{T}: Add {W}. Activate only if you control a Forest or a Plains.

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

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {W}{B}.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {B}{G}.

{T}: Add one mana of any type that a land you control could produce.

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

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {G}{W}.

{T}: Add one mana of any color that a land an opponent controls could produce.

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

This land enters tapped.
{T}: Add {W}, {B}, or {G}.

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

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