Gain all the life you can til you have the mana to drain theirs! Try to get out your Blind Obedience early! Make sure you have Vizkopa Guildmage in your hand as well because turn 3 you can hit the Vizkopa while already starting your extort from the Blind O! Soon your Rhox Faithmender will be out there to get your life off to the races while a sneaky Vampire Nighthawk continues to help. A coupla spells here, a coupla extort here and BAM! You've got them on the ropes while gaining 2x or hopefully 4x life.

Final blow normally mixes your Rhox and Nighthawk's Lifelinks with Rhox's activated ability and Vizkopa's second mana ability. You essentially drain their life!