Dota 2 Regen is for Noobs BigMonD Plays Phoenix
Disclaimer, in low skill or if they don't have good harass then you can get away with skipping regen on Phoenix. In games vs higher level players you wil need regen. I find with Phoenix around 3k MMR is the point you start needing regen. This was one of those beautiful faceless void Supernova games. Its so beautiful, if you can pull it off.