Getting used to this again...

|Soul Trap|0||Trap Card|Trap||Normal|||Activate this card when your opponent declares an attack against a monster you control. Switch control of the attacking and defending monster.|

This is interesting... it's like one of those cards like Gorz that has a psychological effect on players just for existing. People will be 'baiting' it by attacking with their weakest monsters first.

It's powerful and awesome small monster support, but it's easily worked around, so I think it's OK.