Emrakul's Presence

Eldrazi controlled by Emrakul get +1/+1 and Pawn of Emrakul creatures take 1 more power to trigger their abilities.
When Emrakul's Presence enters the battlefield destroy all non-Eldrazi creatures with toughness X or less where X is the number of Emrakul's Presence on the field and create a Pawn of Emrakul for each creature destroyed.