Like the others, he's decent on his own to hate on the same decks as Mindcensor, but when you consider he turns Path to Exile into the unconditionally best removal in the format, and Ghost Quarter into a Strip Mine, you get the real sense of his power
Whenever you cast an Eldrazi creature spell with converted mana cost 7 or greater, you may exile Kozilek's Return from your graveyard
These cards will have additional support, much like the Rapid Strike and Fusion Strike cards of sets gone by
They trade or outright kill every flying creature in combat save for Lord of the Pit and a big, giant Nightmare
Sacrifice the Clue, get a token that you can now sacrifice
I once dubbed it the Boros Harmonize, but I actually think its a lot better, especially if youve been setting up the yard properly