Forum:Level Limit Area B Help.

Hi, I know I'm just bursting in on the forum but I need some quick, precise help with the rulings of this card and no-one can seem to give me a straight answer. I think it's best to ask the professionals!

So, with Level Limit Area B, does it's effect apply to monsters which are placed on the field after it's activation, or does it only apply to the level 4 and higher monsters which are currently on the field?