To promote weak monsters about a 1000 atk or so. First get about three of them in your deck. Then go to custom duel in crush terrain. Have all of the other monsters cards have 1500 atk. Then set the hp to 9999 you want a ton of direct attacks on him. There is a high chance he will high attack monsters. If he tries to summon them they'll go bye. So if you end up like him waste cards until the weak cards come up. Oh and if he goes in a corner do not block his summoning squares! Just block so he cant move then with the monsters blocking him they can direct attack him. Hit him enough until he goes down to 0 hp your monsters may get promoted repeat until necessary.