Demon Slayer — Total Concentration

Commanded by Tanjiro Kamado and Nezuko Kamado as partners, this Mardu (white/black/red) 100-Card Commander Deck is about repetition. A charcoal seller whose sister was turned into a demon is handed a sword form to perform ten thousand times. The Corps is a training regime with numbered ranks, numbered forms and a casualty rate, and the deck makes the training a rule.

• Breathing Form N: twenty Form spells can be cast only on your turn, only one per turn, and only if your form counter is exactly one below their number. Skip a turn without a Form and the counter drops to zero: you begin again at the First Form, with everything spent still spent. Every payoff is a Total Concentration line that does nothing until the counter reaches 5. Yoriichi Tsugikuni is the one exception: he sets it to 12.
• The Mark: seventeen cards carry it. When the creature is dealt damage and survives, it takes a mark counter, +2/+0 and haste — and at your end step you lose 1 life per mark counter you control. Nothing removes one. Shinobu Kocho turns that loss onto each opponent instead.
• The cast: the Hashira, Giyu, Rengoku, Tengen, Mitsuri, Gyomei and Muichiro among them, Zenitsu and Inosuke, and on the other side Muzan, Kokushibo, Akaza and Doma.

Why Mardu

White is the Corps as an institution: ten ranks, a Hashira meeting, wisteria safe houses and a ledger of the dead. Black is Muzan's blood and the ranked twelve who serve it. Red is the breathing itself — flame, thunder, sound, beast. Two combos close it: Gyomei and Tamayo feed The Mark to itself for unbounded counters, and Yoriichi with Total Concentration Breathing reaches the Thirteenth Form in a single turn.

A complete 100-card Commander deck plus 4 tokens, tuned for Bracket 4, available as a digital print-yourself edition or a printed physical deck, and offered in 10 languages.