TCS Rockets, 7626 Miramar Rd, San Diego. June 19th. The Magic: The Gathering Marvel Super Heroes set arrives with the Prerelease — the event where the new cards hit the table for the first time, where nobody has solved the format yet, and where the playing field is as level as it ever gets. Prerelease is the weekend that belongs to the whole Magic community, not just the grinders. The sealed format means you open six packs and build a deck from what you get — there's no showing up with an optimized list, only showing up and figuring it out together. The Marvel set brings IP that Magic players …