Deck mainly based on lifegain, then using your life total to cast powerful or many creatures, and destroy the opponent. Kinda midrange / token strategy.
Always cast the Soul Wardens, Soul's Attendants, and Suture Priests whenever you can. They provide a steady lifegain, and Suture will slowly kill your opponent whenever he casts a creature. Ajani's Pridemates gain +1/+1 whenever you gain life, so after a few turns they're basically huge monsters. Serra Ascendant is a 1 drop 6/6 flying lifelink, and Rhox doubles the life you gain.
Actually, you should never need to block, and try to focus on gaining life to compensate what you lose, or more. You can control with Brave the Elements, Oblivion Rings and Recumbent Blisses, while you cast your creatures.
Use the Wells of Lost Dreams to draw cards and lash out the best combos.
Once you've gained enough life, there are 5 ways to win easily:
1. Felidar Sovereign:
Automatic win over 40 life.
2. Ajani, Caller of the Pride/Brave the Elements:
Summon a ****load of tokens, attack with them, and gain protection from a color for one turn, so they can't be blocked. There you are.
3. Ajani Goldmane/Brave the Elements:
Same as with Caller of the Pride, but with one OP creature (basically a Serra Avatar). Gain protection with Brave the Elements and one-shot kill your opponent.
4.Darien, King of Kjeldor / Ajani's Pridemates:
Just never block incoming attacks, and summon tokens, lots of them. You should be able to gain at least 1 life per token cast, which negates the damage and results in free tokens. Brave the Elements to attack with the tokens.
Also, each time you gain life, the Pridemates get stronger. So if you can keep one alive long enough (usually 3 - 6 turns), you'll be able to cast Brave the Elements and one- shot kill your opponent.
5. Rhox Faithmender, Serra Ascendant, and Celestial Mantle:
Serra Ascendant is not necessary to this one, but helps a lot. Enchant Serra Ascendant (or an other strong creature) with Celestial Mantle, and double your life total whenever you deal damage to an opponent. Rhox's Ability will make that a "triple your life total", and if you know math at least a bit, you can draw your own conclusions on the absurd amount of life you'll end with.