Firstly you're gonna want to add more basic lands to this deck. Reason being; if you draw too many non basic lands then it'll slow down your plays. You'll be waiting longer to play good cards sitting in your hand.
Next add some more knights like the
black knight,
knight of infamy, and protection spells that give your creatures death touch and first strike. This will help your creatures stay on the board longer.
Lastly remember that you're playing two of the strongest colors in the game as far as controlling combat goes. Creature removal will be easier if you play cards that have convoke as you make knight/ soldier/ zombie tokens for
devouring light and
endless obedience. Just a couple of ideas that I saw might be helpful.