What should I do with the Shadow Mewtwo Amiibo Card?

So I have the Shadow Mewtu Amiibo from Pokemon tekken for Wii you but you can't use it for cinnamon even for smash! So should I sell them or wait a few years and then sell?

Why wait a few years if you can't do that?

Vllt price increase, but if it brings nothing or does not work then the price does not rise.

I think waiting and selling does not make sense.

I thought so too.