Imperiosaur

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

Bayou Groff

As an additional cost to cast this spell, sacrifice a creature or pay {3}.

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

When Horned Kavu enters, return a red or green creature you control to its owner's hand.

Haste
When Clockwork Percussionist dies, exile the top card of your library. You may play it until the end of your next turn.

Each spell you cast that's red or green costs {1} less to cast.

Red spells and white spells you cast cost {1} less to cast.