This was on a different server maybe 2 years ago when I first started playing, what it was is, theres certain items that can stack just like runes but be in expensive amounts such as: 250mil | 500mil | 1bil, and what you do with these stacked items is they are bought from an npc so that the maximum amount of money allowed for each player is sky rocketed past the quadrillions. These "cards" can be bought and traded in to an NPC for the exact same amount. Any questions just ask below if I didnt define it well enough.