Grimmlokk
Ahn'Qiraj Raider
It's hardly necessary for sprites. Masks it's easy to stall that first turn, they have the high armor and 15hp so you have plenty of room to fuck about. The lowbie lits all die in one hit.I have to admit I have never had any luck with the Shiva strat. In 22 turns, I have more fire orbs on the map that I can possibly safely store away in the bottom corners.
Sprites seems easier to just bring a beefy healer and 5 of a solid color Resolve style. Enough to easily burn down any that will be matches turns so you have a chance to heal if necessary. I used Shiva last wave but it's not really needed. Though nice=)