Keening Stone + Lord Xander, the Collector

Mana needed: {5}

UBR identity

Commander legal

The 2 combo pieces

• Keening Stone
• Lord Xander, the Collector

How to execute it

1. Declare Lord Xander as an attacker, triggering its second ability, causing the defending player to mill half their library, rounded down.
2. Activate Keening Stone by paying {5} and tapping it, causing the player to mill cards equal to the number of cards in their graveyard, thus milling the rest of their library.

What the combo produces

• Infinite mill for target opponent