Once the update finishes on January 14, there will be another format available in the Casual Play rooms. Yep, you guessed it, Casual Format 2 is here!
As mentioned by Alan Comer in his article, this is similar to the Magic variant called 5-color or 250 by some players. However, the format was handed over to R&D for some rules tweaking before adding it to Magic Online. Here's how the official rules were laid out:
Casual Format 2 decks must contain a minimum of two hundred and fifty (250) cards. There is no maximum deck size. There are no sideboards.
With the exception of basic lands (plains, island, swamp, mountain, and forest), a player's deck may not contain more than four of any individual card, counted by its English card title equivalent. All sets that have been released on Magic Online are legal for Casual Format 2 play.
A player's deck must have at least 20 cards of each of the five colors (white, blue, black, red, and green). Any one card can't be in used to satisfy the requirements of more than one color. For example, a green and white multicolor card could be counted towards the 20 green cards or the 20 white cards, but not both.
Special Mulligan Rule
Before the players take normal mulligans, starting with the player who will play first, the players may take a special mulligan. The special mulligan is as follows:
If the player has one or fewer land cards in hand, or one or fewer nonland cards in hand, he or she may take the special mulligan by revealing his or her hand to all players, shuffling it back into his or her deck, and drawing the same number of cards. Each player can only do this once. Any time a player takes the special mulligan, each of his or her opponents may choose to shuffle his or her hand into his or her deck, and draw the same number of cards (this isn't considered to be taking the special mulligan).
After all players have had the option to take a special mulligan, each player can take normal mulligans.
Banned and Restricted Cards
The following cards are banned in the Prismatic Format:
There are no Restricted cards in the Prismatic Format
There are the basics of playing Casual Format 2: 250 card minimum, no sideboard, special mulligans, and the first banned card on Magic Online!
And yes, it's also available in the Multiplayer Games
And let's not forget the best aspect of playing with 250 cards on Magic Online--the game shuffles for you!