O Portal To The Nightosphere

When this enchantment enters the battlefield,
shuffle up to 10 Nightosphere cards from outside
the game to the top 10 cards of your library.
As long as this enchantment isn't on the
battlefield, Nightosphere cards are not
considered as in the game.
During your upkeep, draw then discard a card.
{3}{b}{r}, Sacrifice a land : Transform this
enchantment. Any player may activate this
ability during their upkeep.