Okay, how hard would it be to get past a 500 card deck with 300 defensive cards? Pretty hard, right? But no one does it in a real tournament because you always time out. Well here's a way to make it work, it will only work if you are at a top table.
If you are playing someone for first place, and you need one game to be undefeated, and if you win you will be the only undefeated, bust out your behemoth. Even if you time out, you're still undefeated. You take the win and PLAN on timing out. This strategy would seem to work very well.