Forest

Lightning Skelemental

Trample, haste
Whenever Lightning Skelemental deals combat damage to a player, that player discards two cards.
At the beginning of the end step, sacrifice Lightning Skelemental.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice Ball Lightning.

Swamp

Mr. Orfeo, the Boulder

Whenever you attack, double target creature's power until end of turn.

Mountain

Groundbreaker

Trample, haste
At the beginning of the end step, sacrifice Groundbreaker.