Ancient Powers

My main motivation is creativity. And that's all about this deck. I doubt if there is a mixing of proliferate with naya based on a goal to have 20-powered creature all together with Mayael's Aria which would result on a won game.

Think about how perfectly are mechanics synchronised. Gyre Sage, Vivid lands and hydras can get extra counters by low-cost spell such as Thrummingbird, card draw proliferate - Tezzeret's Gambit and Plaxcaster Frogling which also passively guarantees hexproof for our key creatures only for 2 grey mana!.(Our Sage also get boofs from hydras!), and therefore can add more mana to newly entering hydras.

I am wondering, if anythink could be change. It's my first deck so far, and it was done within one day. (Wish i could have more days like this :P )

Any suggestions? I'm not sure how would it perform in a real game. And anyone can boost it by adding e.g. shock-dual lands... Also, version with Gilder Bairn is to be considered, but there could be some problem with tapping. I also like Leech Bonder and Contagion Engine but wouldn't they slow down the whole idea of getting 20 power?

I have this deck posted earlier on a different web site. So now, there are 2 showings of my deck on a different site. Source: http://tappedout.net/mtg-decks/ancient-powers/

What are disadvantages of this spell combination? it has a weak early game, I guess.

Btw. Keep Soul's Grace or Tezzeret's Gambit? Shouldn't I exchange Llanowar or Pilgrim with Arbor Elf? I heard it can produce up 2 extra mana (3 with first forest tapping) in one turn, but it doesn't sound very reliable.

As mentioned in description