Ronin, Shadow Stalker

One activated ability arms the board; the other one throws the ammunition. The life-paying mana ability filters into two of any one color, spendable only on Equipment spells or equip costs and only once per turn, which lets you cast or re-equip gear on the cheap while paying in life rather than lands. The second ability is the payoff: tap, sacrifice a piece of Equipment attached here, and hand a creature -4/-4. The pairing is the whole design. Most Equipment-matters commanders reward keeping gear glued to a body and swinging with it; this one treats Equipment as disposable, arming itself with the ritual and then feeding a piece to the graveyard whenever a blocker or a value creature has to die. The removal is fenced to sorcery speed and costs both a tap and a permanent each activation, so it is a proactive attrition plan rather than a repeatable free answer, and the once-per-turn ceiling on the mana keeps the loop from spiraling. What emerges is a black Equipment build that wants cheap, plentiful gear it is happy to lose: closer in spirit to a sacrifice-fueled attrition shell than to the voltron decks Equipment usually anchors, with the life payment as the governor that keeps the engine running hot.