I tried to make an Abzan version of the lifegain deck, but couldn't quite find a good middle ground, so I broke these up into separate decks. My 3 Heads 3 Life deck is the Orzhov version of this. Okay SO, for this one, we're again finding ways to use Vito, Thorn of the Dusk Rose. I looked into green, which has incidental life gain built in, and I came onto a REALLY fun little interaction - check this:

Vito, Thorn of the Dusk Rose

Erebos's Intervention

Basically, you can sink all your mana (please PLEASE use 'qq' on arena to do so) to kill a creature, and this is effectively a Black Banefire with attached lifegain! 

Early Game: Start setting up with Chevill, Bane of Monsters or Scavenging Ooze, ideally you'll draw/already have Vito in hand. On your third turn, you'll get Chevill's trigger, and you can put down Vito.

Mid Game: Now the fun begins. Hit the creature/planeswalker that Chevill put a bounty counter on, and hit it with Assassin's Trophy. You'll gain 3 life, draw a card, and hit them for 3 damage - on TWO mana. Of course, that's the ideal turn. You still have hard removal with Swift End // Murderous Rider and good attrition with Leyline Prowler. On an empty board, start slamming in with Deathless Knight (even if it will die - see below!)

Late Game: That The Great Henge in your hand? You're likely close to casting it, build up your Scavenging Ooze (which also deals 1 to your opponent with Vito out). When you cast The Great Henge, you can now have a card draw engine, a counter builder, and the 2 life you gain also shocks (does 2 damage) to your opponent. With attrition blockers and constant aggression from Deathless Knight (who essentially always comes back to your hand, just tap The Great Henge!) and the blood-sucking from Vito, you're likely in the clear for a victory. If not, hit "Banefire" to the face with the Vito / Intervention combo (see above!)

Sideboard Tips: Sporeweb Weaver can get extremely frustrating for that blue player trying to get in with flyers. That 1 life will also damage them with Vito out and you get the saproling token to go wide against someone (put another way Sporeweb Weaver + Vito = Revenge of Ravens, but better!) The Planewide Celebration might even be main deckable, with Vito out, that's 16 direct damage for 7 mana!

Rotation Tips: Honestly, this deck will mostly survive. I might even change this to take advantage of the upcoming Zendikar ramp to really abuse the Vito / Erebos combo (Planewide wil be gone :/).