Omnakenth, Sage of Gnarl

Vigilance
{x}{w/b}: Omnakenth, Sage of Gnarl gets -0/-X until end of turn. Create an X/X black and white Spirit creature token with flying.
Sacrifice X creature tokens: Omnakenth,
Sage of Gnarl gets +X/-X and gains trample
and lifelink until end of turn.