This idea came to mind when I saw 27 Odin mantles in my retainer. I have more primal tokens that I need since I have what weapons I want. Instead of letting them hit the floor, I want them to be more useful. For example:

3 tokens= Card of the respective primal

5 tokens= EX difficulty primal drop(think kingly whisker)

I know some of these numbers are disagreeable, but it's just an example. I'm also aware that some tokens can be exchanged for things such as glamour and whatnot, but not enough primals take advantage of that.