@JeremyECrawford School of Trans feature Shapechanger: does polymorph need to be prepared to use either w/o spell slot or later "normally"?
— Branden Bio (@brandenwithanE) March 9, 2016
A transmuter must have polymorph prepared, as normal, to cast it, with or without the Shapechanger feature. #DnD https://t.co/9K5QahECdZ
— Jeremy Crawford (@JeremyECrawford) March 10, 2016