The Rack

As this artifact enters, choose an opponent.
At the beginning of the chosen player's upkeep, this artifact deals X damage to that player, where X is 3 minus the number of cards in their hand.

Mystery Booster 2

As The Rack enters the battlefield, choose an opponent.
At the beginning of the chosen player's upkeep, The Rack deals X damage to that player, where X is 3 minus the number of cards in their hand.

Invented in Mishra's earlier days, the rack was once his most feared creation.

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Duels of the Planeswalkers

Time Spiral Timeshifted

As The Rack comes into play, choose an opponent.
At the beginning of the chosen player's upkeep, The Rack deals X damage to that player, where X is 3 minus the number of cards in his or her hand.

You choose one opposing player as this card enters, and it only affects that one player. This choice is not changed even if this card changes controllers. It becomes useless but stays on the battlefield if the chosen player leaves the game.