Phenax, God of Deception + The Walls of Ba Sing Se + Umbral Mantle

Prerequisites

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Steps

1. 1Activate The Walls of Ba Sing Se by tapping it, causing a player to mill at least thirty cards.
2. 2Activate The Walls of Ba Sing Se by paying and untapping it, giving it +2/+2 until end of turn.
3. 3Repeat as mana allows.

Effects

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