Swamp

Stone Rain

Rancid Earth

Destroy target land.
Threshold — If seven or more cards are in your graveyard, instead destroy that land and Rancid Earth deals 1 damage to each creature and each player.

Molten Rain

Destroy target land. If that land was nonbasic, Molten Rain deals 2 damage to the land's controller.

Icequake

Destroy target land. If that land was a snow land, Icequake deals 1 damage to that land's controller.

Nightscape Familiar

Blue spells and red spells you cast cost {1} less to cast.
{1}{B}: Regenerate this creature.

Sinkhole

Mountain

Rain of Tears

Thunderscape Familiar

First strike
Black spells and green spells you cast cost {1} less to cast.

Cavalier of Flame

{1}{R}: Creatures you control get +1/+0 and gain haste until end of turn.
When this creature enters, discard any number of cards, then draw that many cards.
When this creature dies, it deals X damage to each opponent and each planeswalker they control, where X is the number of land cards in your graveyard.

Bloodgift Demon

Flying
At the beginning of your upkeep, target player draws a card and loses 1 life.