Swamp

Rolling Stones

Wall creatures can attack as though they didn't have defender.

Underground River

{T}: Add {C}.
{T}: Add {U} or {B}. This land deals 1 damage to you.

Sacred Ground

Whenever a spell or ability an opponent controls causes a land to be put into your graveyard from the battlefield, return that card to the battlefield.

Sacred Nectar

Samite Healer

{T}: Prevent the next 1 damage that would be dealt to any target this turn.

Sanctimony

Whenever an opponent taps a Mountain for mana, you may gain 1 life.

Seventh Edition