I used to have a GC. The I had a Wii and ditched the GC but kept the GC cards. (I don't recall why I did that, but glad I did!). Oddly I kept one GC controller as well.
Anyway, I soft-modded the Wii - all lovely.
Then I got a WiiU, transferred all my stuff across to the WiiU and gave the Wii...