Curse of Marit Lage + Harbinger of the Seas

UR identity

Commander legal

The 2 combo pieces

• Curse of Marit Lage
• Harbinger of the Seas

How to execute it

1. Because Harbinger of the Seas causes all nonbasic lands to be Islands, and Curse of Marit Lage prevents Islands from untapping during their controller's untap steps, nonbasic lands do not untap during their controller's untap steps.

What the combo produces

• Lock
• Mass Land Denial
• Nonbasic lands do not untap