In this Magic format, all cards must have been printed at common rarity in a Magic set or product. Common promo cards are only legal if the card meets that qualification.
Other than that, the usual rules for constructed decks apply:
Minimum of 60 cards in the main deck
(There is no maximum size for main decks)
Up to 15 cards in your sideboard, if used
No more than 4 of any individual card in the main deck and sideboard combined (with the exception of basic lands)
It's a fun, creative, and VERY affordable format for play!
Entry $2 and 100% goes to the prize pool.