Guardians' Pledge

Sep 22, 2011 · Guardians' Pledge only gives a bonus to white creatures you control when it resolves. Creatures that enter later in the turn and nonwhite creatures that become white later in the turn will not get the bonus.

Sep 22, 2011 · If a white creature that gets the bonus stops being white later in the turn, it will continue to get +2/+2 until end of turn.