Your work has led you to the guild that tries the untried, challenges the status quo, and defies such tedious concepts as "good enough" and "laboratory saftey." Our mission is the venture unflinchingly into the unknown, with no concerns for the risks. Others may fear the volatility of our endeavors, but isn't ignorance the greatest danger of all? We understand that knowledge cannot be gained without passion, and that an explosion is the result.
You've joined us at an especially exciting time. Our visionary guildmaster and parun, the dracogenius Niv-Mizzet, has us hard at work: funneling energy through the city's mana agitators, combining elemental weirds, and cranking the mizzium fluxboilers beyond their breaking point. So strap on your elemental gauntlets and prepare to explore beyond the boundaries of known magic!
--Singe, Goblin Chemister of the Izzet
Each Pre-Release box contains five booster packs for Return to Ravnica and one guild specific pack with the promo card for that guild. The box also contains the exclusive pre-release life counter, a guild sticker, and a letter from the Guild (quoted above).