Titan's Conjuring

When you cast Titan's Conjuring select up to
five non legendary eldrazi creatures you control.
This turn you can only attack with those five
creatures. Those creatures gain hexproof and
annihilator 1, until end of turn.
At the end of your turn if you attacked with
five eldrazi creatures this turn, sacrifice those
creatures. Then search your library for a
legendary eldrazi and put it on to the battlefield.