This is my deck. I was going with a combo of kill cards and stealing from graveyards. The knights are the meat of the deck. The angels and demons are the heavy hitters. Most sorcerys and instants are damaging or kill cards, with some being grave stealers. Very little enchantments or artifacts. Any suggestions would be very helpful.
I think the deck has some odd choices but that they are part of the theme of your deck. I think that 16 spells that cost 6 or more mana is too much. I suggest taking some of them out and replacing them with signets or Mind Stone. Some of the angels seems underwhelming.
There's some really really bizarre choices here, Mugging and Pentarch Ward, in general burn is just not as effective in EDH as it is in 20 life formats - then there's stuff like Nezumi Graverobber and Cadaver Imp that have nothing to do with the theme or the strat.
http://tappedout.net/mtg-decks/knightangeldemon-deck/?cat=cost&sort=
In any case, there are some upgrades you can make:
Thunderbolt for Go for the Throat or Dismember
Murder for Unlicensed Disintegration
Punishing fire is also weird in your deck. Lightning strike is not very good. What about Shriekmaw and Blessed Alliance.
Mortify should also be a consideration.
Crackling Doom.
I think the deck has some odd choices but that they are part of the theme of your deck. I think that 16 spells that cost 6 or more mana is too much. I suggest taking some of them out and replacing them with signets or Mind Stone. Some of the angels seems underwhelming.
8.RG Green Devotion Ramp/Combo 9.UR Draw Triggers 10.WUR Group stalling 11.WUR Voltron Spellslinger 12.WB Sacrificial Shenanigans
13.BR Creatureless Panharmonicon 14.BR Pingers and Eldrazi 15.URG Untapped Cascading
16.Reyhan, last of the Abzan's WUBG +1/+1 Counter Craziness 17.WUBRG Dragons aka Why did I make this?
Building: The Gitrog Monster lands, Glissa the Traitor stax, Muldrotha, the Gravetide Planeswalker Combo, Kydele, Chosen of Kruphix + Sidar Kondo of Jamuraa Clues, and Tribal Scarecrow Planeswalkers
Try looking up Tariel, Reckoner of Souls on EDHREC and see if you can get some leads there?