Dark Knight's Greatsword

The Chaosbringer equip cost is the engine that separates this from every other aggressive sword: pay 3 life instead of mana, once per turn. Re-suiting after a creature dies has always been Equipment's tax, a mana investment that stalls the aggressive black boards most eager to keep swinging. Converting that cost to life taps the one resource a racing black deck spends freely, so a shrinking life total buys repeated re-attaches even as the board turns over. The token half handles the other perennial Equipment failure, the stranded sword on an empty battlefield: this brings its own carrier, a 1/1 Hero that arrives as a 4/1 Knight the moment the sword lands. The +3/+0 and the Knight type-grant carry no defensive pretense, and the life payment reinforces the posture: black's oldest bargain, power now settled in life later, structured here as a self-contained threat rather than a support piece waiting on a body to hold it.