Requires

Ghave, Guru of Spores must be on the battlefield. Carnival of Souls must be on the battlefield. Soul Warden must be on the battlefield. Panharmonicon must be on the battlefield. Ghave has at least two +1/+1 counters. Mana needed:

Steps

1. Activate Ghave's first ability by paying 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 and sacrificing the Saproling token, putting a +1/+1 counter on Ghave.
6. Repeat.

Results