text: If the targeted permanent is an Aura, you choose a legal permanent, player, or other card for the token to enchant as it enters. A permanent you choose must be able to be enchanted by the token. (For example, if the Aura it's copying is red and has "enchant creature," the permanent must be a creature, and it can't have protection from red.) Since the token Aura wasn't cast as a spell, it doesn't target what it will enchant; you may choose something that has shroud, for example. As the ability resolves, no player can respond between the time you choose what the token will enchant and the time it enters. If you can't choose something for the token to enchant, it enters unattached, then is put into your graveyard as a state-based action.