Forum:Diffusion Wave Motion

So, the opponent has only three Ojama Tokens on the field and I have a level 7 or higher Spellcaster on my side of the field and a face-down Ojama Trio. I use my Diffusion Wave Motion and destroy one of my opponents Ojama Token.

If I use my face-down Ojama Trio after destroying the first Token, would I be able to attack these new Tokens with Diffusion Wave Motion's effect or can I only attack monsters that existed on the field when I first activated Diffusion Wave Motion?