Karplusan Forest

{T}: Add {C}.
{T}: Add {R} or {G}. Karplusan Forest deals 1 damage to you.

Shivan Reef

{T}: Add {C}.
{T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

When Ruination Rioter dies, you may have it deal damage to any target equal to the number of land cards in your graveyard.

Racers' Ring enters tapped.
{T}: Add {R} or {G}.
{2}{R}{G}, {T}, Sacrifice Racers' Ring: Draw a card.

Frontier Bivouac enters tapped.
{T}: Add {G}, {U}, or {R}.

{T}: Add {C}.
{T}: Add {G} or {U}. Yavimaya Coast deals 1 damage to you.

Reveal cards from the top of your library until you reveal a nonland card, then put all cards revealed this way into your hand.