Chasing cards

Opened the five boosters of "Dark Ascension" that came with the theme decks and I jagged two mythic rares - Moonveil Dragon and a foil Elbrus, The Binding Blade (a sword that transforms into a demon). As far as I'm aware, the frequency is 1:8 packs, not taking into account shiny editions. Alas, there was no sign of Sorin, Lord Of Innistrad, a la-di-da planeswalker I would instantly sell for the market price of $50, investing the proceeds in additional boosters.