Personal build for Firebird Hardcore. Based on DMG but also fast escaping. You will always manage to teleport away from danger.
The Firebird Set 6 Bones will give you an extra life, and Unstable Anomaly is basically a cheap extra life that will safe you before dying. It will help you if can't manage to escape.
I will use Templar as my follower giving you an extra cheap life if Unstable Anomaly or Firebird is on cooldown. You will have to equip your follower with Enchanting Favor (Templar can't die), because your Templar can't safe you if his dead. Templar skills 1-1-2-2 he will heal you if your health is low and he will heal you and knock back enemies if you are about to die.
This build is basically giving you 4 cheap extra life. As for starters always escape before running low on health! Your extra 4 life is only for saving your stupid mistakes.