Damn! - well let me figure out another way to defend against your pretty angel.
hmmmm....
AH! Since you are playing a mostly white deck I assume you've got loads of small creatures, but since I'm playing a mostly black deck I have got loads of destroy target creature cards. Since I can't target the protected angel I would have to use them on all your other creatures at first. (If there are too many one or two "pestilences" (Enchantment: for one black mana every creature suffers -1/-1) should shrink their numbers.
And finally comes "diabolic Edict" (Target PLAYER

sacrifices a creature)
Since you have to choose the angel...