Defiler of Instinct

First strike
As an additional cost to cast red permanent spells, you may pay 2 life. Those spells cost {R} less to cast if you paid life this way. This effect reduces only the amount of red mana you pay.
Whenever you cast a red permanent spell, Defiler of Instinct deals 1 damage to any target.

Rooting Kavu

When Rooting Kavu dies, you may exile it. If you do, shuffle all creature cards from your graveyard into your library.

Migration Path

Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.
Cycling {2} ({2}, Discard this card: Draw a card.)

Untamed Kavu

Kicker {3} (You may pay an additional {3} as you cast this spell.)
Vigilance, trample
If Untamed Kavu was kicked, it enters with three +1/+1 counters on it.

Mountain

Flametongue Yearling

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.)
Flametongue Yearling enters with a +1/+1 counter on it for each time it was kicked.
When Flametongue Yearling enters, it deals damage equal to its power to target creature.

Gruul War Chant

Attacking creatures you control get +1/+0 and have menace.

Forest

Flametongue Kavu

When Flametongue Kavu enters, it deals 4 damage to target creature.

Kavu Primarch

Kicker {4} (You may pay an additional {4} as you cast this spell.)
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
If Kavu Primarch was kicked, it enters with four +1/+1 counters on it.

Rampant Growth

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Kavu Monarch

Kavu creatures have trample.
Whenever another Kavu enters, put a +1/+1 counter on Kavu Monarch.

Horned Kavu

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