At one point I had a deck very similar to this one. I noticed in competitive play, cards such as Parallel Lives can really slow token decks down, when they are supposed to do they opposite. Turn 4 is usually when heavy damage starts coming in, and wasting a turn to drop Parallel Lives can really screw you. You can take a look at my deck if you want,
This deck used to be WB. I added G to see if it worked well. You're right about the Parallel Lives it can really make or beak a game if played wrong. I tend to wait until I have 6 mana; I'll cast Parallel Lives and Gather the Townsfolk or flashback Lingering Souls . I usually only have a real problem playing Fungal Sprouting . Finding the right moment to cast it is a bother.