Shaman of the Dark Covens

{2}{b/g}, {t}: Put 2 0/1 black Raven tokens with flying into play.
As long as you control a black Garruk planeswalker, Ravens you control get +1/+0 and gain deathtouch.
As long as you control a non-black Garruk planeswalker, Ravens you control get +2/+1.

The shaman may control the birds, but Garruk controls their nature.