Angelus, Protector of Purity

When Angelus, Protector of Purity enters the battlefield, choose a color. Creatures of the chosen color gain +3/+3 and vigilance as long as Angelus, Protector of Purity remains under your control.
{7}{w}{w}: All creatures you control gain unblockable and indestructible until your next upkeep. All creatures you control must attack this turn if able