Rootwalla

{1}{G}: Rootwalla gets +2/+2 until end of turn. Activate only once each turn.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Target creature gets +3/+3 until end of turn.

Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Haste
{1}: Gingerbrute can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice Gingerbrute: You gain 3 life.

({G/P} can be paid with either {G} or 2 life.)
Target creature gets +2/+2 until end of turn.

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