Phenax, God of Deception + Consuming Aberration + Traumatize

Prerequisites

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Steps

1. 1Cast Traumatize by paying its mana cost, causing an opponent to mill half their library, rounded down.
2. 2Activate Consuming Aberration by tapping it, causing the opponent to mill cards equal to the cards in opponents' graveyards, milling the remainder of their library.

Effects

• Infinite mill for target opponent