Cavern Harpy + Chakram Retriever + Somberwald Sage

Mana needed: {U/B}

BGU identity

Commander legal

The 3 combo pieces

• Cavern Harpy
• Chakram Retriever
• Somberwald Sage

How to execute it

1. Activate Somberwald Sage by tapping it, adding {U}{U}{U} or {B}{B}{B}
2. Cast Cavern Harpy by paying its mana cost.
3. Chakram Retriever triggers, untapping Somberwald Sage.
4. When Cavern Harpy enters the battlefield, it triggers, returning it from the battlefield to your hand.
5. Repeat.

What the combo produces

• Infinite colored mana that can only be spent to cast creature spells
• Infinite creature LTB
• Infinite ETB
• Infinite storm count