Return target creature you own to your hand. You may put a creature card from your hand with the same name on the battlefield. Then, you may attach an Enchant Creature spell with a converted mana cost of two or less from your hand onto that creature.
For Challenge # 101. Faster than fast is tough. Originally, this was going to be jump in the hand, then jump out. But I couldn't help but notice that that wasn't very different than Cloudshift. Technically, it's a better spell, since you can keep the creature in your hand... but hanging out in the hand doesn't represent being 'quick like bunny'.
So, after thinking, I decided that most people say "I'll be quick like bunny" when they're going to pick something up and come right back. Hence, the 2cc aura.