Emerson, Heir of the Aviary

Devoid (This creature is colorless)

Deathtouch, immunity to creatures.
Emerson has indestructible and spellproof as long as
you control an eldrazi spell. Eldrazi you control get
+3 -1

{x} {t} pay 5 life create X 1/2 Bird Eldrazi with
flying, annihilator {1} and "This creature can't be
blocked by any creature without activated abilities"
then amass Eldrazi 3