Green-White Weenies

The first step would be to link us to the deck in question.  I believe this is the deck in question.  It makes it easier for people to offer advice. 

That being said, what direction are you trying to take this deck in?  I see a lot of token creation, but nothing like Intangible Virtue to buff them.  I also see a small werewolf theme, which doesn't really fit the rest of the deck.  I would also strongly recommend taking out the Orzhov Basilica's.  You'd honestly just as soon have an Orzhov Guildgate that hurts you less if it gets Strip Mined.  Honestly though, the Overgrown Tombs are probably enough Black sources to flashback Lingering Souls.

If you do end up going towards G/W Tokens, Rhys the Redeemed is always a good choice.