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

Prerequisites

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Steps

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

Effects

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