Black Black mana is tied with Swamps, and is affiliated with amorality (it doesn't believe in good and evil), focusing on your own needs above everything else, taking advantage of others, death, undeath, social darwinism, capitalism, and self-confidence
But when you battle someone - and that someone happens to have a rare card that you don't - you get the prompt to add that person as a friend at the end
In the Official Shop you can buy ONE PIECE CARD GAME products and participate in weekly events together with fellow players
Pay Day will get you that extra draw for one Energy while also doing ten damage each time
The spree mechanic gives the card both scalability and flexibility on what you can do with it, making the card never bad