Dante~Vergil
I thought the god cards were banned from use in a duel because they were to good of cards thats what i read on a yugioh site a really long time ago like when they first came out in english version.
This is what I've read, "Slifer, The Sky Dragon" and "The Winged Dragon of Ra" are banned from duels due to they have no exact attack points on them. "Obelisk the Tormentor" is allowed in duels because he has attack points, but he is not allowed in tournaments, only personal duels.