Omega, Xenomees True Form

You may only cast Omega by sacrificing a
creature named 'Xenomee, the Nihilist' you own.
Indestructible, Double Strike, Trample, Haste,
Ward {p/w}{p/u}{p/b}{p/r}{p/g}
When Omega enters the battlefield, sacrifice all permanents you control and, if it was not cast,
you skip your next 3 turns and end your turn.
This ability can not be countered.