A CardGamer magazine promo has been revealed, and it’s an unusual support card for Darkness Decks!

PR/0649 スイーティ・サーティーン Sweetie Thirteen

“ギリギリが楽しいのよ！(The very limit is fun!)”

Grade 1 / Normal Unit / Dark Zone – Dark Irregulars – Human

Power 3000

Shield 5000

CONT (VC/RC) Darkness: During your turn, for every card in your Soul, this Unit gains Power+1000.

AUTO (RC): When your turn ends, if there are 13 or more cards in your Soul, this Unit is Retired.

Source