Boundaries Crossed & Stormfront. Stormfront was chock-full of amazing cards, and Boundaries crossed it just...Ooh, it's good. Maybe it's my nostalgia of the time that I bought BCR packs in, but that set has some sort of amazing sense of wonder to it that's incredibly hard to replicate. It was the first set I got a booster box for, it was what really got me into the game, and it made Landorus one of my favorite Legendaries of all time(Lando/Lucario was my first deck on PTCGO...Ah, the memories...)