Out of the gate the first take at a Standard Green Black deck fell flat on its back.
I made many small changes.
I also made other decks with green.
...and my favorites: mono Black and mono Green.
Without dual lands a tricolor deck is dead in the water, but I need to learn how to play.
...and after a few hours of playing these decks the verdict is the all but mono green lose EVERY game. The Standard field is just too broad for an ISD+M13 deck that has not been optimized either with power planeswalkers such as Tamiyo, or, in the case of all decks, dual lands and useful artifacts.
Although it is too early to make a final judgement, the new Garruk and the new Liliana seem best suited for mono decks. It takes a lot of mana to drop a 2FFF Garruk!! The ISD 2F Garruk is much more playable.