2HG Sealed rules

Everything both players open goes into one pool. Each builds a deck of at least 40 cards from it, and basic lands are added freely. A card can only be in one deck at a time, so splitting the pool is the first real decision.

Whatever neither deck uses is the team's shared sideboard. Both players can reach into it.

From Reality Fracture on, Wizards' recommended kit is one Prerelease Pack plus two Play Boosters per team. A Prerelease Pack holds six Play Boosters, so a team opens 8, the number the Tournament Rules recommend for 2HG Sealed.

Before Reality Fracture, each team received two Prerelease Packs. Wizards still allows that if a store's players prefer it, so check what your store hands out.

A 2HG match is a single game, and a drawn game doesn't count toward it. Play continues while time allows until one team wins.

The team shares 30 life and loses at 15 poison counters. The team that goes first skips its first draw, and each player's first mulligan is free.

At a prerelease without decklists, players may swap cards between their decks and the shared sideboard between matches. That freedom ends at Competitive enforcement, which no prerelease uses.

Teammates can also talk at any time, during deckbuilding and during the game. The exception is a player who may have picked up hidden information elsewhere while a teammate is still playing.

The 2HG Rating on each card page is built around 2HG Commander. The mechanisms it reads still apply in Sealed: “each opponent” lands twice, and a sweeper answers two boards.

What changes is scale. At 30 life, a drain for three is a bigger share of the game than it is at Commander's 60. Read the reasons on a card page, not just the score.