This improves durability over time
This is where I had to reconstruct my long-neglected high school trigonometry skills
Mythics (20 of 20 known) Liliana of the Veil $90 Karn, Liberated $90 Cavern of Souls $80 Tarmogoyf $70 Snapcaster Mage $70 Temporal Manipulation $65 Karakas $60 Dark Depths $50 Emrakul, the Aeons Torn $40 Kozilek, the Butcher $40 Bitterblossom $40 Vengevine $38 Mana Vault $30 Mikaeus, the Unhallowed $27 Ulamog, the Infinite Gyre $25 Leovold, Emissary of Trest $20 Lord of Extinction $16 Sigarda, Host of Herons $16 Balefire Dragon $15 Platinum Emperion $14 That folks, is as good as your mythics list is ever likely to get in a booster box based Magic set
While it is true that a few of these cards have now been Masterpieces twice (Mana Vault, Ancient Tomb, Through the Breach), we need only look as far as Mana Crypt and Sol Ring for examples of cards that have had multiple rare and shiny versions that have tended to trend upward together once the Masterpiece started to rise
It digs deep for a third land drop, hitting nearly 90% of the time in most decks and improving consistency across the board