Omnath, Locus of Voids

Anihilator X where x is how many elementals
or eldrazi you control

Landfall — choose one:
• Cascade
• reveal the top 6 cards of your library, deal damage to any target equal to the amount of elementals or eldrazi revealed this way, put one of the cards into your hand and the rest on the bottom of your library
• Put an elemental or eldrazi card from your hand to the battlefied, sacrifice it at the begining of your end step