A little bump for this thread. Found out about this game because of Azusa. Today is the
last day you can register for the pre-opening. That includes an opportunity to roll a free SS character. I've got no idea how relevant those are in this game, but if you plan on playing, I suggest grabbing the free extra stuff.
The game apparently launches in a few days.
http://dragonace.magicboxasia.com/
As for rolling a SS tier character;
You can roll several times on the Gacha, but once you accept a character, you are stuck with it.
I have a fake facebook for all these mobile games, and you can do more rolls if you share some add for the game on there. So that worked out well.
If you run out of rolls you can make a new account within a minute, and the same facebook page will still work.
I don't know how relevant the card is but it did not take me much time so whatever.