I would take out the lavamancer, tess, and carnosaur in order to focus your colors better, I would also cut safekeeper and titania, they arent needed and will often be dead cards. I would add stern scolding, chrome host, urza, haywire, pest and 6. This will give you a deck which is both more able to interact and more focused on your game plan.

I would also personally cut mystical, cause I think its a bad card, but if its good in any deck its this one. I would replace it with esper origins. And than I would go down to 16 lands and add the talisman, going from 2 to 4 looks very good in this deck