honestly keep it its great for decks about speed with just 4-4 lines of pokemon for instance Blissey
T2K and it can be put in any other deck imo its a lot better then night maintenance and should be kept
If I ever got a TSD, I would keep it for two reasons:
1. It would complete my MT set (except for Lucario Lvl. X and some reverse holos);
and 2. It's such an amazing Trainer card, especially in speed decks.