For non-foil cards, 1 in about 3 Draft Boosters will have a showcase or borderless card (any rarity excluding basic lands) with about 1 in 15 Draft Boosters having that card being a rare or mythic rare
Taking an extra turn as soon as she's cast means she has pseudo-haste, and annihilator 6 can typically decimate most of your opponent's board (quite flavorful if you think about it)
Overall, while Elsha may not add anything new to Jeskai as a color combination, she does refine some issues that Narset, Enlightened MasterNarset, Enlightened Master poses, and she provides impressive depth if you're willing to work for it
Repeat after me: Synergy is not the same thing as having a game plan. No
This will help keep your card in the envelope/mailer if its torn in transit, but wont stick so much that its hard to get the card out of the mailer (thats why I dont recommend double sided tape for this - it can be so strong you risk bending the card trying to unstick the toploader
He trades raw power for positioning and rewards precise timing
