I don't like cards like boon reflection or beacon of immortality because they only gain you life and are boring to play. Just my 2 cents.
Permalink
I would take out Boon Reflection, Bow of Nylea, Wilt-Leaf Liege and Collective Blessing maybe. Then I would add Wall of Reverence, it works very well with Ajani Goldmane's ultimate, as it basically doubles your life every turn.
http://www.reddit.com/r/magicTCG/comments/1u59mm/i_made_a_20_standard_deck_including_sideboard/?sort=new
You should add more ARC BLADES
Maybe Pacifism for some permanent pseudo-removal and Shock for removal or even finish your opponent?Martial Glory is also good and for the sideboard you could add Vandalblast and Shattering Blow.
Beckon Apparition maybe?
May I suggest Terminate and/or Desfigure?I would recommend Diabolic Edict if you don't mind that's not legal in Modern.Having something like "target player draws a card'' would be good too because if you target yourself you get card advantage and if you target you're enemy you could like make with that and stormbreath dragon and liliana of the veil.Nice deck, btw.
Dreadbore maybe?
Maybe take 2 buried alive and 2 entomb and add 4 spiteful returned? And substitute felidar umbra for lifelink. It's almost the same thing, with felidar you can change the enchanted creature but lifelink is more solid, as it is a one mana drop.
Nighthowler, Spiteful Returned and Hopeful Eidolon would fit here like a charm. Check them out.
I would add some enchantment creatures and remove the buried alives. I would also remove two Isolated Chapels and add 2 more Plains