Sif Franir, Energetic Summoner

{t}{r/g}: Create a 1/1 blue Carbuncle creature token.
{r/g}{r/g}{r/g}, Sacrifice a Carbuncle: Create a 3/3 red
Egi creature token with "Whenever this creature
enters the battlefield, it fights up to one target creature you don't control.".
{r/g}{r/g}{r/g}{r/g}{r/g}, sacrifice a Egi: Create Bahamut, the Dreadwyrm, a legendary 9/9 colourless Dragon
Avatar with Trample, Haste and Fading 1.