The mana is ok but since you added more white cards to your side board (and I'm not trying to beat a
dead horse with a stick here), you are going to need more
plains in your deck. Having only 1 white mana source with all the cards being included in this deck would turn good cards into bad draws if you have only one white producing land. You can still
balance out the deck with three colors, just try to add maybe 2-4
plains and you should be ready to rock and roll.