Evo. wiz casts Storm Sphere and uses Sculpt Spell on ally in effect. Ally succeed on future saves while remaining in sphere?
— Eric Green (@quadhund) June 12, 2017
Sculpt Spells is used the turn you cast a spell and is intended to affect only saves made that turn. But RAW, it works on all the saves #DnD https://t.co/2MYLIL1tqb
— Jeremy Crawford (@JeremyECrawford) June 12, 2017
It specific says that only the saves of the original spells are affected.