Yenna, Redtooth Regent, and Mystic Barrier

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Mystic Barrier on the battlefield
• Yenna does not have summoning sickness
• You have at least two opponents
• available

Steps

1. Activate Yenna by paying and tapping it, creating a token copy of Mystic Barrier
2. As the copy of Mystic Barrier enters the battlefield, choose the opposite direction that was chosen for the nontoken Mystic Barrier
3. At the beginning of each of your upkeeps, keep the direction chosen for each Mystic Barrier
4. As long as there are three or more players in the game, creatures cannot attack

Results

• Creatures cannot attack