True-Name Nemesis

As True-Name Nemesis enters, choose a player.
True-Name Nemesis has protection from the chosen player.

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As True-Name Nemesis enters the battlefield, choose a player.
True-Name Nemesis has protection from the chosen player.

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As True-Name Nemesis enters the battlefield, choose a player.
True-Name Nemesis has protection from the chosen player. (This creature can't be blocked, targeted, dealt damage, or enchanted by anything controlled by that player.)

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Protection from a player means that True-Name Nemesis has protection from each object controlled by that player. If an object has no controller (such as a card in a graveyard), its owner is considered its controller for this purpose.