You do not need to own an actual copy of a card in order to conjure it, and a conjured card does not need to obey format legality or deckbuilding restrictions. For example, in a game of Mystery Booster 2 Limited, Toralf’s Disciple can conjure Lightning Bolts into your deck, even though the card Lightning Bolt isn’t found in Mystery Booster 2 and isn’t normally legal in the Limited format.