the front side of Harbinger of the Seas
the back of a classic MtG card
the front side of Curse of Marit Lage
the back of a classic MtG card

Color Identity: U, R

Initial Card State

  1.  Harbinger of the Seas and Curse of Marit Lage on the battlefield.

Steps

  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.

Results

  1. Nonbasic lands do not untap.
  2. Mass Land Denial.

Metadata

  1. This combo produces a lock.
  2. In 21 decks according to EDHREC.
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