Defender

Add White. Having access to perimeter captain will give you more explosive draws and will also shut down aggro decks since you'll be gaining life every time to block. Pride gaurdian fits much the same bill, though it's not as good. white also gives you access to wall of omens, which is sweet.

Also, green sun's zenith to help you find overgrown battlements. Having twice as many chances to draw battlements will really help your game plan of ramping up mana.

As a final note, I think that feed the pack would be a better win condition than eldrazi conscription. you only have 4 creatures that can attack in this deck. With feed the pack, you can churn out wolves, especially with tree of redemption. you do lose out on gaining 10 life every two turns with conscription on tree, but that combo isn't really all that great to begin with.

There's more I could talk about (I love defender decks) but I'll leave you with these suggestions for now.

TL;DR: add white, add Green sun's zenith, trade Eldrazi Conscription for Feed the Pack.

Hope this helps.

u stole this idea from me@!

Get rid of animate wall and put in rolling stones. That will do it for all of them.

Awesome deck, I like Vent Sentinel a lot. If you had black, wall of blood would've been good.
My only advice is to tune up lands, I guess you need much more forests than those.

If you could drop a comment here, I'd really appreciate that. Thankyou.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=367426