Mystic Barrier

Enchantment    (CMC:5)

When Mystic Barrier enters the battlefield or at the beginning of your upkeep, choose left or right. Each player may attack only the opponent seated nearest him or her in the last chosen direction and planeswalkers controlled by that player.

18 C13 • ENMatt Stewart

™ & © 1993—2013 Wizards of the Coast

Legal in: Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Mystic Barrier {4}{W} Enchantment When Mystic Barrier enters the battlefield or at the beginning of your upkeep, choose left or right. Each player may attack only the opponent seated nearest him or her in the last chosen direction and planeswalkers controlled by that player.

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10/17/2013
Mystic Barrier affects only what players and planeswalkers each player may attack with creatures he or she controls. It doesn’t affect what players may be targeted by spells or abilities or other interactions.
10/17/2013
Mystic Barrier doesn’t affect creatures that enter the battlefield attacking.
10/17/2013
In some formats, you may need to disregard teammates sitting between you and the opponent seated nearest you in the chosen direction. In formats like Emperor, other rules may prohibit you from attacking that player.
10/17/2013
If two Mystic Barriers are on the battlefield with two different chosen directions, you may not attack a player or planeswalker unless that player or the controller of that planeswalker is the opponent seated nearest you in both directions. (This happens most often in two-player games.)

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Card Mystic Barrier is not on TCGPlayer.