Graven Cairns

T: Add C. R/G, T: Add RR, RG, or GG.

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

T: Add C. G/U, T: Add GG, GU, or UU.

(T: Add R or G.) This land enters tapped unless you control two or more basic lands.

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

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

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

T: Add C. 1W, T: Prevent all combat damage that would be dealt by target attacking creature this turn.