Board Thread:Show-Related Questions and Answers/@comment-5571357-20140512054818/@comment-8345449-20140512064446

Well, the writers tend to play very fast and loose with the rules of magic. I mean you have three basic rules of magic that can't be broken, except sometimes they can under certain conditions.

And, the wand at the end didn't require any ingredients to re-create the time travel portal. So I guess the very first time the portal was opened, it needed the ingredients. Subsequently, it could be re-opened without the ingredients.