@JeremyECrawford if a lv 20 wizard uses shapechange to turn into a ancient white dragon can he still use his spells?
— Joshua Olivier (@Gojumpoffacliff) March 14, 2016
As DM, I'd allow that wizard to cast spells in the dragon form. #DnD https://t.co/brsTdpHObd
— Jeremy Crawford (@JeremyECrawford) March 21, 2016