I had a deck similar to this. For better power i would include Eidolon of Countless Battles or Ethereal Armor . I prefer Eidolon simply because he stays on the field if the bestowed dies, but ethereal is cheaper and you can gain first strike. A deck like this needs to stay relatively cheap. I would remove Spectra Ward Dictate of Erebos and Doomwake Giant . Giant is a nice card, but that late into the game reduces his usefulness if he cant be played early. I do like dictate but it just doesn't fit in with the deck, Skybind would do a lot more for you than dictate. Blind Obedience is cheap and has an extort plus gives you defense which fits very well with your deck but it would be out of rotation with the new set.

The last thing i would suggest would be to sub out Erebos, God of the Dead for another Athreos, God of Passage . Erebros with what your deck would be designed to do would cause way too much damage to you if you try to use his ability since your deck drains you as well. I would however keep it to play against life gain decks

Thanks for goldencrisis 's comment.

I agree that the cost of Dictate of Erebos is a bit high and does not fit the deck well.

For Spectra Ward , I treat it as a mean of protection in the final hits in late game. I haven't used it so I don't know if it works like what I think. If I remove it, I may need to add some other means to protect my creatures. (Still thinking...)

I like Doomwake Giant and I think it secure some mid-to-late game competitiveness for my deck. It is cheap (in $) so I can try it to see whether it fits.

I know Athreos, God of Passage is overall a better choice than Erebos, God of the Dead but I don't think I can afford to have two. (They are expensive!) I am not sure whether Erebos, God of the Dead 's card drawing ability would drain me too much. I put it simply for countering lifegain decks and provide a way to draw cards. (Only 2 Read the Bones is not enough...)

Skybind looks like a solid choice. Its ability looks very interesting and is useful both for triggering constellation effect and giving troubles to the opponent.

Eidolon of Countless Battles is definitely a good power boost. The problem is that I need to find a card slot to place him in...