Ghave, Guru of Spores + Carnival of Souls + Soul Warden + Panharmonicon

Ghave, Guru of Spores

Carnival of Souls

Soul Warden

Panharmonicon

How it works

1. Activate Ghave's first ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Saproling creature token.
2. The Saproling enters the battlefield, triggering Soul Warden and Carnival of Souls twice.
3. Resolve both Soul Warden triggers, causing you to gain two life.
4. Resolve both Carnival of Souls triggers, causing you to add and lose 2 life.
5. Activate Ghave's second ability by paying 1 and sacrificing the Saproling token, putting a +1/+1 counter on Ghave.
6. Repeat.