Cavern of Souls

As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {1} to your mana pool. {T}: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Urborg, Tomb of Yawgmoth

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

Dismember

({B/P} can be paid with either {B} or 2 life.) Target creature gets -5/-5 until end of turn.

Eldrazi Temple

{T}: Add {1} to your mana pool. {T}: Add {2} to your mana pool. Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi.

Relic of Progenitus

{T}: Target player removes a card in his or her graveyard from the game. {1}, Remove Relic of Progenitus from the game: Remove all graveyards from the game. Draw a card.

Caves of Koilos

{T}: Add {1} to your mana pool. {T}: Add {W} or {B} to your mana pool. Caves of Koilos deals 1 damage to you.

Underground River

{T}: Add {1} to your mana pool. {T}: Add {U} or {B} to your mana pool. Underground River deals 1 damage to you.

Ashiok, Nightmare Weaver

+2: Exile the top three cards of target opponent's library. -X: Put a creature card with converted mana cost X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types. -10: Exile all cards from all opponents' hands and graveyards.

Thoughtseize

Target player reveals his or her hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Polluted Delta

Watery Grave

Blight Herder

Drowner of Hope

Eldrazi Skyspawner

Wasteland Strangler

Eldrazi Mimic

Reality Smasher

Thought-Knot Seer

Wastes

Island

({T}: Add {U}.)

Swamp

({T}: Add {B}.)