Silver Screen Silver screen foiling was used in Innistrad: Double Feature , and it hopefully wont return
When the triggered ability finishes resolving (or if its countered or otherwise removed from the stack), turn the scheme face down and put it on the bottom of the scheme deck unless the scheme is an ongoing scheme
Pair it with any doubling effect and you have a win condition by turn five or six
Joyful Stormsculptor's last ability will trigger whether you tapped any creatures to pay for the spell or not, as long as it has convoke
On the other hand, Jeskai and UW Control aren't that far away from being top-tier decks, and it's possible that unleashing Jace, the Mind Sculptor would lead to the return of hardcore tap-out control, which I would enjoy but many people dislike
Any friction in the checkout process costs precious time