As equipment should I go for Firebird or Vyr's?

It's for Gr + speedfarm.

Firebirds

Make sure fire is your highest elemental damage to activate the firebird set bonuses to do this either find your amulet or bracers with fire damage or reroll them to fire. Stack up on cooldown reduction on gloves, shoulders, weapon, and source. So you can stay in archon form as long as possible.

An if your speed farming put aether walker in cube to tele with reapers wraps an change one of your gems to boon of the hoarder as well.

Yes, I figured that out.

Is this build still best on season 6 or nerfed?