How can you create a combo with Yenna, Redtooth Regent, Mystic Barrier?
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[START OF COMBO]This combo can be formed with Yenna, Redtooth Regent, Mystic Barrier

Color identity: GW
Mana cost: {2}
Steps:
  1. Activate Yenna by paying {2} 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.[END OF COMBO STEPS]

Result:
  - Creatures cannot attack[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Yenna does not have summoning sickness.
  - You have at least two opponents.
[END OF COMBO PREREQUISITES]
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