What are we talking about, Chinese martial arts?
Agree with poster above who says that Dumba needs to re-prove himself before he is worth Nylander. Also agree that Dumba isn't the cure to what ails the Leafs Blue line.
My main objection to the proposed deal between TOR and MN is that Nylander is a luxury, not a need, and that JEE is a need, not a luxury that can be disposed of lightly. I know his stats haven't been impressive, but he is a terrific shutdown defender in the mold of Mikko Koivu, and I anticipate him getting better production this year once Koivu retires and Staal slows down even further, finally giving him some PP TOI.
Now, if I was convinced that Nylander could be a perennial 60+ point C, then a Dumba + JEE return for him wouldn't be out of the question. I just haven't seen that from him, and likely won't, with TOR's lineup. I also understand TOR not being crazy about the deal till Dumba gets back on track. I will tell you that JEE would be PERFECT for them, though, and just what they need.