It seems that Wizards of the Coast always find a way to make Shalai, Voice of Plenty broken in Standard. With Sephara, they would make an indestructible team that could be almost impossible to deal with.
The alternative mana cost also allows Sephara to come into play as early as turn three. All you need is cheap fliers in the first two turns, and then you can tap them to put Sephara on board in similar fashion to Convoke mechanic.
Also, Rally of Wings would be a great addition to such a deck, as well as Divine Visitation.
So it looks like white weenie fliers are making a breakthrough in this Standard meta!
Aside from this list of the best Core Set 2020 cards for standard, be sure to check out our other MtG guides here.