Drakkisath is a powerful unit with the Banner of Flame ability (Nearby enemies take 50% more Elemental damage). It makes sense to build the deck with some elemental damage units like Shaman, Blizzard, Whelp Eggs, and Pilot.
The goal is to use your units to protect and synergize with Drakkisath. Quilboar can serve as a temporary tank, while Shaman's armor will help him survive. Then you can unleash the damage with Blizzard, Pilot, and Whelps to push lanes.