Mystic Barrier | Copy Enchantment

Cards

Mystic Barrier and
Copy Enchantment on the battlefield (
Copy Enchantment as a copy of
Mystic Barrier).
You have at least two opponents.

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