Mystic Barrier, and Copy Enchantment

Prerequisites

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

Steps

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

Results

• Creatures cannot attack