Mystic Decree + Stormtide Leviathan

U identity

Commander legal

The 2 combo pieces

• Mystic Decree
• Stormtide Leviathan

How to execute it

1. Mystic Decree causes all creatures to lose flying and islandwalk.
2. Because Stormtide Leviathan prohibits creatures without flying or islandwalk from attacking, no creatures can attack.

What the combo produces

• Creatures can't attack
• Lock