UDE killed it in favour of WoW TCG and then lost the license for it.
Thus UDE lost all the TCG games they had.
Put it this way, the game revolved around building a deck themed on many of the super hero and villain teams.
Then beating the crap out of each other.
"Would you please let me join your p-p-party?
There was a survey you could do for the Fluttershy promo a ways back, and on Black Friday they had limited amounts of all the con promos (aside from Rarity) for $4.00 that would ship anywhere (the $4.00 was to cover the shipping costs) which is how I got Derpy, RD, and a Second Fluttershy promo.
Following them on Facebook (if you have one) probably wouldn't hurt, just in case they do another promo giveaway in the future.