couple of suggestions for em:
1.Release them faster.
2.Decrease the price of packs, if you can't change odds of cards.
3.Put up "boss" NPC's (like batora) each expansion, and establish quests that involve beating those NPC's to obtain packs. You must not make them one-time only, like everything else that's good in Alteil (once a day MM, once a year events, once-in-a-lifetime EX lotto.)
You saw how crowded Alteil got when you did the batora event, people want to feel part of the story, and they also want rewards!
What have you got to lose?


