Sac stuff to the troll to make it bigger, keep mana open either on your board or with deathrite shaman to regen it...once you have enough mana, cast or bestow nighthowler (onto the troll) and swing for big damage!

Jarad also is an alternative as a win con, if you can get your bigger creatures out and use his ability to sac creatures dealing direct damage. This works pretty well with nemesis of mortals if you're in the game long enough to pull it off