Ok.
Problems:
Bad/non-synergistic cards (I understand its casual, but there are some cheap upgrades in current sets), worse cards include revitalise, brasi's
solidarity, London Lifechanter,
swallow whole. The rest of the cards are fine but could be upgraded.
Too many
lands, 18-20 is more optimal, since your highest cmc spell is 4 mana (if you take out lifechanter), this'll minimise useless draws.
Tips:
Your deck should care about life-gain, that incidentally gives extra (e.g. counters or 4/4 angels).
Add cards like
Griffin Aerie, Soul Sister, Maytr of Sands,
Soul's Attendant.