Actually, it works. I tested with DEMA and Higs made it with USEM. And I drew absolutely all upped cards.
Edit : Oh, I noticed you said it's "Bad". Let me just give one example to why it isn't bad. Or maybe 2. I don't know. I'll just type 'em (or it) out.
1 - You'll get less bad draws. 6x Lava Destroyer, 6x Photon, 6x Cremation. Now tell me if that isn't a exploit.
2 - You don't deck out faster, because with the right deck you just KILL them faster.