Devoted Druid + Machine God's Effigy

GU identity

Commander legal

The 2 combo pieces

• Devoted Druid
• Machine God's Effigy

How to execute it

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

What the combo produces

• Infinite blue mana
• Infinite green mana