Ideas?

[Magicman2213]

What's up guys, I have recently bought the Izzet vs Golgari duel decks and I have became very fond of the golgari deck. I have made some slight modifications to the original deck but it played great as it was but I found that it was built almost perfect but some things could be changed. My main idea for this deck was to put in 3 plainswalker cards into the deck. Since this is a green and black deck I was thinking of putting Garruk Wildspeaker, Liliana Vess, and Vraska the Unseen. What do you guys think? Is having 3 plainswalkers In your deck taking away more than it is giving, let me know what you think so that I can make a decision. Thanks!