Magic: the Gathering has explored a stunning variety of planes (or worlds) across its 30-year history. Some planes have emerged as fan favorites, such as the city-plane Ravnica and the Gothic horror plane Innistrad, while other planes are less popular and might have appeared just once each. An easy way to explore all these planes outside regular expansion sets is the Planechase format, complete with special Planechase cards.
Source：https://www.cbr.com/mtg-planechase-cards-without-sets/
