Uriah, Necromantic Hunter

+6: Put a 2/2 green wolf with Vigilance and Haste on target opponents side of the field.
-1: Destroy target 2/2 green wolf with Vigilance and Haste. Gain 4 life.
-15: Destroy all 2/2 green wolf with Vigilance and Haste. Target opponent loose X life. Where X equals double total power of wolfs that died this turn