Invasion was the first expansion released on Magic Online. Since then, the older expansions from Mirage forward have been retroactively released with accompanying draft and sealed queues. The sets before Mirage, however, were not built for limited play and did not present a fun or balanced draft environment. Because of the nature of the online environment, most cards enter the system through drafting. The Masters Edition series is Wizards of the Coast's solution to bring the game's earliest cards online in draftable sets.