It is impossible to tell at the time of casting
1 case of the Awakening of the New Era expansion
Seven of the 15 mythics in the set are worth more than the $10 MSRP of the pack they come from, and the high end is doing just fine with Jace, the Mind Sculptor, Imperial Recruiter, Ensnaring Bridge, and Chalice of the Void, but after the seven good mythics, there's a massive drop off from Animar, Soul of Elements at around $13 to Gisela, Blade of Goldnight at under $4
Diabellstar the Black Witch - Age of Overlord Current TCG Market Price: $42.88 7
It seems likely to do so again, even if that means returning to more straightforward, combat-centric wincons