Machine God's Effigy, and Cinderhaze Wretch

Prerequisites

• Machine God's Effigy on the battlefield
• Cinderhaze Wretch on the battlefield

Steps

1. Activate Machine God's Effigy by tapping it, adding
2. Activate Machine God's Effigy by putting a -1/-1 counter on it, untapping it
3. Repeat

Results

• Infinite blue mana