Are Triple Triad cards useful outside of exchanging for MGP?

[KokonoeAiyoko]

I have a bunch of cards I could train in for MGP, but I was wanting to know if they have any other uses before I trade them in. Thanks.

[Dillia]

As of right now, no. You can put one in your collection then the rest go to the vendor. However, there is a possibility that at some point in the future, there may be a mechanic where you might loose cards by loosing matches. I will go ahead and trade in all my duplicates untill I hear that they will be adding the ablilty to have cards taken from you, then I will keep a spare on a retainer.

[Nyalia]

I tend to save the cards until I need just a bit more MGP to purchase a reward, and then use them to push me there. That way, I waste as little MGP as possible, since after each purchase, my MGP resets to 500.

As a note, * cards trade in for 5 MGP, ** for 10 MGP, *** for 50 MGP, and **** for 200 MGP. I don't know how much ***** trade in for (haven't checked yet).