Mystic Barrier - Commander 2013 - 18

Enchantment

Mana Cost: {4}{W}

When this enchantment enters and at the beginning of your upkeep, choose left or right.
Each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent.

Rare · Commander 2013 · #18 (C13)

Illustrated by Matt Stewart