Crab Umbra + Phenax, God of Deception + The Walls of Ba Sing Se

Mana needed: {2}{U} at least

UB identity

Commander legal

The 3 combo pieces

• Crab Umbra
• Phenax, God of Deception
• The Walls of Ba Sing Se

How to execute it

1. Activate The Walls of Ba Sing Se by tapping it, causing a player to mill thirty cards.
2. Activate Crab Umbra by paying {2}{U}, untapping The Walls of Ba Sing Se.
3. Repeat as mana allows.

What the combo produces

• Near-infinite mill
• Near-infinite self-mill