Flying
As Entropic Specter enters the battlefield, choose an opponent.
Entropic Specter's power and toughness are each equal to the number of cards in the chosen player's hand.
Whenever Entropic Specter deals damage to a player, that player discards a card.
The opponent does not discard a card if all the damage is prevented.
You choose one opposing player during resolution and it only affects that one player. This choice is not changed even if this card changes controllers. It becomes 0/0 if the chosen player leaves the game.