Volrath, the Shapestealer, Morselhoarder, and Devoted Druid

Prerequisites

• Volrath, the Shapestealer on the battlefield
• Morselhoarder on the battlefield
• Devoted Druid on the battlefield
• Volrath does not have summoning sickness
• Morselhoarder has any counter on it
• Devoted Druid has at least one counter on it
• available

Steps

1. Pay 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

Results

• Infinite colored mana