Volrath, the Shapestealer + Morselhoarder + Devoted Druid

Volrath, the Shapestealer

Morselhoarder

Devoted Druid

How it works

1. Pay 1 to activate Volrath to make it a copy of Devoted Druid .
2. Tap and untap Volrath using Devoted Druid's ability four times, adding four and four -1/-1 counters.
3. Pay to activate Volrath ability targeting Morselhoarder.
4. Remove four -1/-1 counters from Volrath, adding four mana of any color.
5. Repeat.