Maybe try Garruk Relentless  ^Flip he will still poop tokens or allow you to look for your big creatures.

Personally, I'd drop Ajani for another Garruk as he can drop tokens much faster than Ajani can. Also, it'll help the consistency of the deck as well.

Yeah, I'm pulling out Ajani, Caller of the Pride and a Geist-Honored Monk for two Gavony Township s, and I'd like to add a Garruk Relentless  ^Flip to go with my Garruk, Primal Hunter , 'cause they're both pretty good at popping out tokens.

For the sideboard, consider:

[suggestion:Plummet] to take out any Olivia Voldaren you may run in to.[suggestion:Centaur Healer] can be very helpful against red deck wins and zombie decks.[suggestion:Knight of Glory] also helps against zombies.[suggestion:Odric, Master Tactician] This guy might be a good answer to Thragtusk, who's probably going to be all over the place for a while.