The Avatar

Flying, Haste, Menace, Death touch, Flash,
{3} {t} Gains +1000/+1000 (can choose who you attack, Cannot attack the player)
Any other creatures that enter your battlefield instantly become 10/10
{w}{w} Add +10/+10 on Air spirit army
{r}{r} Kill All opponent creatures with {r} as the mana colour
{u}{u} You gain control of all token creatures that you don't currently control
{g}{g} Create {x} 5/5 Human token creatures where X is how much total Mana you have