Flying, trample, haste
At the beginning of combat on your turn, look at the top three cards of your library. You may exile a creature card with mana value 3 or less from among them or from your hand. Put the rest of the revealed cards on the bottom of your library in any order, then put all creature cards exiled with Celestial Shepherd onto the battlefield. They gain flying, trample, and haste until end of turn. Exile them at end of combat.