Return of the Titans

When Return of the Titans enters the Battlefield,
Search your Library for,
Kozilek The Bane of Worlds,
Emrakul the Mind Annihilator,
or Ulamog the Destroyer and
put it in your hand, then shuffle your library.
Legendary Eldrazi Creatures cost {2} Less to cast
Colorless nonlegendary spells cost {1} less to cast
{10}Until your next turn, All Eldrazi Creatures gain Annihilator 2 and hexproof