Junk Tokens

Lingering Souls should certainly have a place in this deck. Where you sould make cuts for it is up to you, but I would suggest 2 Entreat the angels, 1 bloodline keeper, and 1 tragic slip. It's just a very valuable spell due to its flahback, and is powerful as both a defensive and offesive spell. Really good at creating a barrier of tokens to protect planeswalkers.

Midnight Haunting needs a place in here too.

First of all, I'd remove the Abundant Growths and implement Farseek for extra acceleration. Further more, I'd take out the Fogs and put Druid's Deliverance in it's place. This allows you to do the same as Fog as well as put another token into play (2 if you have Parallel Lives in play).
To make Farseek more viable, try to get your hands on the Return to Ravnica duals, so that you look up those too. As well as a couple of Evolving Wilds. These will fix your need for colored mana and improve your draws, due to the fact your deck contains 1 (2 if you count the Evolving Wilds) land(s) less, which slightly improves your chances of drawing Entreat the Angels.
If you decide to play Evolving Wilds, I'd also advice to add 2 Plains and at least 1 Swamp to your decklist, instead of some Forest cards. Which allows Evolving WIlds to really fix the mana that you need.
Also, if you decide to play Temple Garden / Overgrown Tomb, then I'd pick Arbor Elf instead of Avacyn's Pilgrim, because then it can give you more then just 1 white mana.
As for possible card advantage in this deck, I'd go for either Altar's Reap or Underworld Connections. But neither more then 2.

Another thing you could try:
You could also remove all your creatures, put Farseek in the deck instead of Avacyn's Pilgrim and take out the Bloodline Keeper and put in other token generators, such as Midnight Haunting (as mentioned before). This may be a bold approach, but it does give your deck a real theme and a touch of originality. But this is a type of play which you either like or dislike.

I see you took some of my advice and altered your decklist, it looks nice.

The reason I only mentioned Temple Garden and Overgrown Tomb as shock duals, is because it's also a forest. You want to play Garruk, which is very heavy on your green mana supply, so try to get your dual lands all to produce green at least. So that you can quickly play a Farseek early game and get your Arbor Elves into play first or 2nd turn. And have a use.
This way you can add , the single white or single black mana to your mana pool and still play Garruk relative easily (as you don't have anything that costs 2 white or 2 black, except for Entreat the Angels and the Bloodline Keeper). So I'd take out the Isolated Chapels and put back the Forests that you took out to put in the black and white duals. To be able to cast Garruk, once you get him in your hand.