Can we make this Black Heart available in-game that gives you 77 attack stats?

May I ask how this exp x2 card work? Is this a permanent item?

Good news on all of these, and it's live now! The Mu Lung Dojo Vanquisher Medal comes from So Gong in the Dojo: choose to receive a medal. Each stage's medal asks for 100 defeats of that stage's master on solo floors, and you need to take the door to the next floor for each defeat to count. The Gifted Carnivalian Medal is now at Spiegelmann's 2nd Carnival office: play at least 50 matches with a 70% win rate and he'll hand it over (only matches from 10-28 on are on record). Every town with a Donation Box now keeps its own record: whoever makes the biggest single donation to that town's box earns that town's Donor Medal from the box, and if someone beats your donation, the medal passes to them. The Black Heart has no way to get it, so we've taken it off the wiki. The 2x EXP Card isn't permanent: it lasts its 10- or 30-day period, only works during its listed hours (server time, UTC) while it's in your Cash inventory, and doubles EXP from monsters. Its tooltip now shows the date it runs out everywhere you see it.