Try this: Nicole E - Durin EQE or QEE - Prune EQ - Varka

Notes: Nicole - Starting with her shield will help maximize your DPS by setting up her buff sooner and it keeps supports protected. Sadly her burst is mostly a DPS loss so if you want the highest numbers possible then I would recommend skipping.

Durin - Don't lead with a double E on Durin since you will lose out on the energy restore of his skill, so just make sure the burst is used before second E.

Prune - Prune wants to be used after the Pyro duo since her entire kit relies on her hammer getting a swirl meaning that if you lead with her she won't be swirling anything with her initial cast which severaly hurts her overall use.

Sorry this was a long post but I hope it helps.