Rhystic Shield

Oracle Text

Creatures you control get +0/+1 until end of turn. They get an additional +0/+2 until end of turn unless any player pays 2.

Card Rulings

10/4/2004 Only affects creatures you control when it resolves.
10/4/2004 Each player (starting with the current player and going in turn order) gets the option to pay when this spell resolves.