My friend gets me everytime on this tip or strategy that he uses. He has his deck stacked with monsters with a defence of 1700 or more. Then you need to have 3 shild and swords, so you have a good chance of getting one out,. Once you have 4 mosters at 2000 defence, filp them all into attack mode, then play shild and sword. You will have a combinded attack of 8,000. If your opponet has some monsters out, play rigakey to get rid of thire monsters. Thats the trick!