5-Color (Format)

5-Color is a constructed format, similar to Commander and a spiritual predecessor to it, though unlike Commander it was not primarily a multiplayer format. It was supported on Magic Online for a substantial period, under the name "Prismatic".
Unlike most formats, even casual formats, playing with ante was explicitly supported and encouraged by the rules committee. This did not apply in the Magic Online version.
==Deck construction==
A 5-Color deck has a minimum size of 300 cards, and every deck must contain at least 25 cards of each color. Each multicolored card counts as any one of its colors.[5-Color rules https://web.archive.org/web/20221204105550/http://5-color.com/]
==Mulligans==
Due to the large deck size, additional mulligan rules were added (supplementing the standard Paris mulligan). A player could use the 'original' DCI mulligan rule and claim a free mulligan by revealing a hand containing 0 or 7 lands, and additionally if it contained exactly 1 land; after those were completed, they could use the Paris mulligan. However, each of those three conditions was usable once only, and if the free mulligan was taken, the other player was permitted to take a free mulligan as well. The land-count mulligan was not usable after taking Paris mulligans.
==References==