you don't have a guaranteed target for the clone in your deck except for guile which isn't as cool cuz it's ability doesn't stack (at least I don't think so). I also feel you need more Daze-like counters (counters that you can play while tapped out) something like foil or disrupting shoal (i have both :))
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or -2CoS => +2 thrive
I think thrive would be a great addition in this deck, and with the amount of creatures you have with presist, the cauldron of souls seems unnecessary -2 CoS => {+1 of each anthem} or {+1 quillspike, +1 devoted druid}
You have a good amount of solid dredge cards, but I feel you're missing cards that abuse dredge to the max. This deck uses dredge as a card-advantage for an aggro style, if you want to really abuse dredge, use it as a ridiculous combo engine. http://www.youtube.com/watch?v=pDbGuv21PJ4&feature=related