So I'm a little upset, but I am realizing this is just part of MtG. I spent some time last year putting together some nice decks and stocking up on quite a bit of the M13 cards. And then work / life got in the way I didn't get to play as much as I thought.
Now, M13 has rotated out. I can still use my RtoR and GC and I've already ordered a deck builder's set for M14 which should get here today. I realize that I can still technically use M13 for casual gameplay, but not sure I want to continue investing time deck building with them.
Should I just sell them? Do I gain anything by holding onto them? Maybe just keeping the rare cards?