With this move if your opponent has a powerful card on the field your opponents monster will be destroyed no matter what.

When your opponent has a powerful card on the field play Dream Clown in attack mode and mirror force face-down. When it is your opponents turn he can't attack with his monster because mirror force will destroy it, and he can't skip attacking because Dream Clowns effect will destroy it. When it is your turn again if your opponent didn't attack switch dream clown to defense mode and destroy his high level card, and if you have it play monster reborn to get the monster back.