Based on the Pai Gow booster format.
The main way of playing is:

Each player is dealt 15 cards.

Each player looks at their cards and separates them into five piles of 3 cards each.

You play 5 consecutive, separate games of Magic. In game 1, each player’s first pile becomes their opening hand. In game 2, each player’s second pile becomes their opening hand. And so on.

Each player starts at 5 life.

Players have access to an unlimited amount of mana in any combination of colors.

The player who was done first (with their distribution of cards into piles) gets to choose whether to play first or second in the first game. In subsequent games, the loser of the previous game gets to choose. The second player wins any draws.

You don't lose to decking as you have no library.

--I've added this to cube cobra to track the changes over time because I think it is going to just grow more and more powerful as RCQ season goes on