Many cubes strive to have no 'dead cards', meaning that every card will be at least playable in the vast majority of cases. In this cube, in this format, I am comfortable including niche or dead cards due to the players' ability to instantly draft three extra copies of a card once per draft. This means the players need to find far fewer playables. It also means I am able to enable things that require duplicates (such as Cloudpost) as well as more niche archetypes (such as Merfolk tribal) without dedicating a significant portion of the cube to supporting those decks. That's the theory, anyway.