Cool deck, looks like a lot of fun to play. As for some cards definately worth running:

Voidslime - This is just broken. I have disrupted so many plays with this card, one of the best counterspells available to BUG.

Sakura-Tribe Elder - is good ramp and has really nice synergy with Sheoldred, Whispering One .

As for Boundless Realms , I don't know how good it will be for you. Most of your cheaper CMC land ramp only grabs basics, and you only have 13 basic lands in the deck. Doesn't seem super good for 7 mana. I've run it in the past, but ultimately found that bang for buck it's not worth it unless you have a lot of basics / landfall.

Also, Lim-Dul's Vault is awesome, especially with Damia out :P (but why not just run both)

Hey thanks! I've been looking into getting a Voidslime, it'll probably be one of the next things I buy. I'm still giving Boundless Realms a shot, I haven't gotten to play it yet so if it sucks, then I'll try out the Elder =) Thanks!

Thran Dynamo > Worn Powerstone

That may be true.

Sadistic Sacrament is super good if you can ramp into it early. Even if you only pay the bbb, you get to peek at an opponent's library, which is pretty cool on its own, AND exile three of whatever you want. IF you do pay the kicker, fuhgettabout it! you just shut somebody out of the game.

@KuRiMoNsTeR Hmm, I hadn't thought of putting that one in this deck. What would you suggest I take out?

The issue I have with the card is that it doesn't interact with either their hand or their field, it just prevents certain draws, and they may have it in their hand already. The positives though, like you said, can take almost all of the haymakers out of the game for someone. I'm unsure, but if you can make a good argument for why it is better than something else I have in the deck, let me know =)

And thank you for the suggestion!

Wit's End and Jace, the Mind Sculptor , epic win con.

Jace, the Mind Sculptor + Wit's End .

@Sauron_ Well, I used to have Myojin of Night's Reach and Mind Twist in the deck, but the problem is that nobody liked playing against it, and I like to have fun playing Commander, as well as everyone else at the table having fun, instead of just trying to win. I appreciate the suggestion though!

Sorry for the late response! I would take out Deadeye and palinchron for s sacrament and Tomorrow, Azami's Familiar because A) Infinite combos are weak IMO B) I don't see any super cool/fun outlet for infinite mana (ie a hydra) and C) The sacrament is like an anti-tutor on steroids and tomorrow has synergy up the butt with Damia. You should check out my Damia deck and let me know what you think Damia, Stone Cold Gazer