The Plains Destroyers

Annihilator 3 (Whenever this creature attacks, defending player sacrifices two permanents.)
Protection from coloured.
The Plains Destroyers enter the battlefield with
X +3/+3 counters on it, where X is the number
of eldrazis on the battlefield.
Whenever an eldrazi enters the battlefield, put a
+3/+3 counter on The Plains Destroyers.