Slifer the sky dragon, game breaker?

A monster with 6000 max ATK would be hard to stop but I would just use a feild nuke (black rose dragon,E-Hero Sub Zero etc) or summon light and darkness dragon then summon a weak monster for slifer to destroy. This is all assuming you can bring 3 monsters out onto the feild and have Slifer in your hand ready to summon. That version is banned anyway