Wild Nacatl

Wild Nacatl gets +1/+1 as long as you control a Mountain.
Wild Nacatl gets +1/+1 as long as you control a Plains.

Imperiosaur

Spend only mana produced by basic lands to cast this spell.

Kird Ape gets +1/+2 as long as you control a Forest.

When Burning-Tree Emissary enters, add {R}{G}.

As an additional cost to cast this spell, sacrifice a land.
Search your library for a land card, put that card onto the battlefield, then shuffle.

This spell costs {1} less to cast for each creature you control.
Vigilance (Attacking doesn't cause this creature to tap.)

As an additional cost to cast this spell, sacrifice a creature.
Reckless Abandon deals 4 damage to any target.