Angelic Shield goes to the graveyard when you activate the ability, but the targeted creature does not get returned until the ability resolves. All your creatures lose the bonus while the ability is on the stack which may result in the targeted creature being destroyed before the return can take effect.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.