Its a powerful effect, though, perhaps as a sideboard card against control or together with The Rack
You'll end up looking to your typical cards like shock lands, filter lands, and even maybe some of the new hotness (in this case, Overgrown Farmland)
Focussing on sacrificing just about anyone and anything to achieve his goals, Sephiroth encourages you to keep sacrificing creatures to heal, deal damage, and draw, all to gain access to his incredibly powerful alternate form
Access Maze does cost seven mana, but the cards effects more than make up for taking the time to cast it
Its true its not perfect
Unlike the Sword of X and Y cycle, it successfully promotes use of the combat step without discouraging interaction