Horseshoe Crab + Mesmeric Orb + Multani's Harmony

GU identity

Commander legal

The 3 combo pieces

• Horseshoe Crab
• Mesmeric Orb
• Multani's Harmony

What must be in place

Horseshoe Crab does not have summoning sickness.
Multani's Harmony attached to Horseshoe Crab.

How to execute it

1. Activate Horseshoe Crab by tapping it, adding {U}.
2. Activate Horseshoe Crab by paying {U}, untapping Horseshoe Crab.
3. Mesmeric Orb triggers, causing you to mill a card.
4. Repeat.

What the combo produces

• Infinite self-mill