Bvash, Dire Berserker

+1: Bvash,Dire Berserker becomes a 3/3 Bear warrior with indestructible haste and "when this creature destroys another gain 4 life" until end of turn
-2: add one mana of any color to your mana pool this mana does not empty at the end of your turn
-5: spend all the mana in your mana pool create a 2/1 bear warrior with haste for each mana used