Magus of the Moat + Mystic Decree

Magus of the Moat

Mystic Decree

How it works

1. All creatures lose flying and Islandwalk.
2. Magus of the Moat prevents things without flying from attacking.
3. Creatures can not fulfill the conditions nessasary to attack.

This curious little lock relies on a clever rules interaction to completely shut down the combat step. By playing Mystic Decree first, you strip all creatures of their flying keyword entirely. Once that foundational change is in place, Magus of the Moat steps in to read the board state and decisively forbid any creature without flying from attacking. Because every creature has lost its flight, they all fail to meet the requirements needed to declare an attack, bringing the red zone to a total standstill.