One route that's been talked about is to maximise the genesis hydra and go G/r with planeswalkers, with hydra finding domri and xenagos. This route is powerful, but chord of calling has no place in such a list (tutoring hydra with it is bad, hydra flipping it is bad, domri flipping it is bad, etc.), which I'm sad about because chord is itself an insanely strong card. But when it can't get the main CA engine in your deck, i.e. Garruk, and has anti-synergy with many of the other best cards in your deck, it's just not so good.
Of course, there is another big CA engine for green:
This has performed surprisingly well for me so far.