Play 3 Star Guardian and use either Lux or Yuumi as your early item holder for Taliyah. Level up to 4 at stage 2-1.
At level 6 you want to activate Gadgeteen as well as Defender by adding both Lulu and Poppy. The extra items from Gadgeteen will get you on a win streak easily. Level up to 6 at stage 3-2.