Really I don't believe that you'll be needing the eldrazi in this deck, simply because he may slow you down. But I do like the enchantment theme that you have going for this deck. IF you want to further expand on this I suggest adding more grim guardians (for the life taking of your opponent),
doomwake giant (because every enchantment will deal some damage to your opponent's creatures),
roaring primadox (if you want to keep bouncing your creatures that have enter the battlefield effects), and also for a nice battle trick since you're already able to produce any color of mana i would suggest
ghostly flicker. This way you can keep bouncing your creatures that have the enter the battlefield effect and you can also untap lands you already used in the same turn just by exiling them and returning them back to the field. This would help
courser of kruphix a lot. Just a couple ideas i think might help.