Flash

Each player with more than seven cards in hand discards however many cards they have in excess of seven, and each player with less than seven cards in hand draws a number of cards equal to the difference of seven minus how many they currently have.
Start a subgame; each player has a empty deck, but starts with the cards in their hand in the main game also in their hand in the subgame, and each player starts with a emblem with "

: Add one mana of any type into your mana pool". All players skip all of their draw steps in the subgame, and players cannot concede the subgame. You are the first player in the subgame. When the subgame ends, each player who won the subgame gains 12 life and scry 1; each player who lost the subgame loses 5 life and mills a card.