I like this deck. However, I think you should consider adding a Seer's Sundial as it combos very nicely with Oracle of Mul Daya. Begin turn (draw), see a land on your deck, play it; flip next card, if it's not a land, activate the seer's sundial ability, paying 2 mana and drawing that card, then play the next card if its a land, activating the sundial again to give you even more card advantage. I am pretty sure that you can play the stack that way. Let me know what you think.
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How about buying a few Unearth's. For (B) you can return target creature from your graveyard to play with CMC 3 or less. Disentombs are similar, for (B) you return a creature to your hand (in my opinion thats much better than the above nature's spiral because the deck is heavily creature based). More Doom Blades would help, as they are incredible creature control versus non-black decks. In terms of how you don't like the sacrificing creatures, try getting a few bloodghasts if you don't mind spending a money (7.99ea.) as they can be repeatedly sacrificed and returned to the battlefield.