Graxois

Flying, Haste, and Trample
{b}{r}{g}{u}, create a 5,5 dragon with flying
Blue creatures have {t}{x}, target opponent mills
X cards
Black creatures have {t}{x}, destroy target creature
with converted mana cost X
Red creatures have {t}{x}{x}, this creature does
X damage to any target
Green creatures have {t}{x}{x}, target creature
you control gets +X,+X