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

Prerequisites

• Phenax, God of Deception on the battlefield
• The Walls of Ba Sing Se on the battlefield
• Crab Umbra on the battlefield
• at least available

Steps

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

Results

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