Mystic Barrier, and Mirrormade

Prerequisites

• Mystic Barrier on the battlefield
• Mirrormade on the battlefield
• You have at least two opponents

Steps

1. At the beginning of each of your upkeeps, Mystic Barrier and Mirrormade trigger, choosing "left" for Mystic Barrier and "right" for Mirrormade
2. As long as there are three or more players in the game, creatures cannot attack

Results

• Creatures cannot attack