From the Vault: Realms

{T}: Add {C}{C}. This land deals 2 damage to you.

Boseiju enters tapped. {T}, Pay 2 life: Add {C}. If that mana is spent on an instant or sorcery spell, that spell can't be countered.

{T}: Add {U}. This land deals 1 damage to you. Threshold — {U}, {T}, Sacrifice this land: Target player draws three cards, then discards three cards. Activate only if seven or more cards are in your graveyard.

{T}: Add {C}. {T}: This land deals 1 damage to target attacking creature. Activate only during the end of combat step.

(This land isn't a spell, it's affected by summoning sickness, and it has "{T}: Add {G}.")

{T}: Add one mana of any color. Whenever you tap this land for mana, target opponent creates a 1/1 colorless Spirit creature token.

Cumulative upkeep—Pay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When this land enters, sacrifice a land. Creatures you control can't attack. Prevent all damage that would be dealt to you.

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

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

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

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

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

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

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.