Here's how this deck works:
1. Have a green/black deck with lots of weak allies and Orb of Unity.
2. Play lots of low-stat, low-cost allies, but don't defend with them (defend with one or two high-stat allies).
3. When there are a lot of allies, play Orb of Unity and then Night of the Vampires.
4. Every ally on your side will get a huge stat boost since they're all temporarily the same subtype, Vampire Ally.
5. Dominate!
Important cards:
-Orb of Unity (one of the main two cards in the strategy)
-Night of the Vampires (the other vital card needed to pull this off)
Strong against: slow-developing blue decks.
Weak against: red aggro decks that put out allies faster than you, object removal.