Glacial Chasm

T: Add C. T, Sacrifice a creature: You gain 1 life.

T: Add C. T: Add R or G. Each opponent gains 1 life.

T: Add C. 2R, T: Shivan Gorge deals 1 damage to each opponent.

You may have this land enter tapped as a copy of any land on the battlefield.

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

(T: Add G.) As this land enters, you may reveal a Treefolk card from your hand. If you don't, this land enters tapped. T: Add W or B. This land deals 1 damage to you.

T: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters tapped. T: Add W. W, T: You may play the exiled card without paying its mana cost if you attacked with three or more creatures this turn.