Flickering Ward

Enchant creature
As Flickering Ward enters, choose a color.
Enchanted creature has protection from the chosen color. This effect doesn't remove Flickering Ward.
{W}: Return Flickering Ward to its owner's hand.

Mystery Booster 2

Tempest

When you play Flickering Ward, choose a color.
Enchanted creature gains protection from the chosen color.
o
W: Return Flickering Ward to owner's hand.

If you choose White, the enchanted creature will have Protection from White. This will cause any other white Auras attached to that creature to be put into their owner’s graveyard, but Flickering Ward will remain on the battlefield.