Existential Nightmare Queen

Eminence - Eldrazi, Slivers, and Horror creatures both on the battlefield and in your hand have devoid.

Slivers and Eldrazi creatures you control gain "{2}: Create a 1/1 Eldrazi Sliver creature token. It has "Sacrifice this creature: Add {c}.""

All Horror creatures you control have +8/+8 and Shadow.

{w}{u}{b}{r}{g}{5}{x}: Other creatures you control gain your choice of either Annihilator X or Toxic X.