Maybe... I don't know if the Genju are good enough though. EI's expensive like Tooth & Nail but seems less powerful. My impression is that T&N is so good because it can pull out something overwhelmingly powerful, like Darksteel Colossus + Kikki Jiki (and attack for 11 the same turn)... And you can still cast other spells next turn, too. Somehow the Genju don't make quite the same impact, IMO. Not that I play a lot of tournament-level Standard, so maybe you are on to something here.