The "Unstable Terrain" deck lets you harness the primal energy of the indigenous wildlife of Zendikar. This dangerous plane's powerful beasts will run roughshod over your enemies.
Roil Elemental

Many of your creatures have abilities that trigger whenever a land enters the battlefield under your control. Windrider Eel, Territorial Baloth, and Baloth Woodcrasher each get bigger until end of turn; the first two get +2/+2, and Baloth Woodcrasher gets +4/+4 and gains trample too. Grazing Gladehart lets you gain 2 life. Turntimber Basilisk can force enemy creatures to block it so that its deathtouch ability can kill them. Roil Elemental is the most dangerous of them all: it lets you gain control of your opponent's creatures as long as it stays on the battlefield.

Your landfall creatures work best when you have lands to play, and your other cards help you find more lands to feed them. Merfolk Wayfinder and Frontier Guide both have abilities that find you more lands, and the instant Harrow lets you trigger your creature's landfall abilities when your opponents least expect it. You may also need to deal with some of your opponent's creatures. Paralyzing Grasp keeps an opponent's creature from untapping, and Mind Control steals a creature and lets you use it against your opponent.