Lightning Storm has two effects, with one that destroys all Attack Position Monsters on the opponent's field and the other to destroy all backrow instead
Note - this is a "special" set, conventional booster boxes do not exist (you can only get packs from various collection boxes, tins, etc)
While Varchild, Betrayer of Kjeldor brings down the grade a bit, the uniqueness of the Izzet commanders is enough to push it past Esper and onto the top of our list
Overall these changes distinguished several of the key types of monsters we see today, with Flip and tribute summons becoming present
Theres a Yusei deck focused on synchro summoning Junk Warrior and company, an Akiza deck full of plants, and my personal favourite Crow has got those iconic Blackwings