I am determined to make this work.
I thought about those and they seem to slow down the deck, not to mention I only have Pack Rat as my token source. If other creatures made tokens then maybe.
As soon as rtr came out I traded for a full playset of pack rat, just because of the potential I saw in them. The only thing that really screws up most pack rat decks, is board wipes. In order for pack rat to work, you obviously have to discard most of your hand. And then if you have like 3-4 pack rats on the field and they Supreme Verdict I was screwed. I would try and find away to survive field clearers, the only card that comes to mind right now is Rootborn Defenses , but that's outside of your mana colors. +1, for a unique deck idea, and because I like Pack Rat
For avoid mass removal, use Golgari Charm last ability.