Text (CF+errata): 7/7. ; As ~this~ enters the battlefield, choose an opponent. ; ~this~ gets -1/-1 for each card in the chosen player's hand. [Oracle 2009/07/08]
It tracks the chosen player even if that player stops being an opponent. [Conflux FAQ 2008/12/16]
In a multiplayer game, if the chosen player leaves the game, their hand size is considered to be zero. [Conflux FAQ 2008/12/16]
