Phenax, God of Deception + Consuming Aberration + Lord Xander, the Collector

Prerequisites

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Steps

1. 1Declare Lord Xander as an attacker, triggering its second ability, causing the defending player to mill half their library, rounded up.
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