Piston Sledge

Free attachment is the whole pitch here: the equip cost is paid not in mana but in artifacts you were happy to spend anyway, which lets the +3/+1 land on a creature the moment the equipment resolves, no extra mana tax, no waiting a turn. That entry trigger sidesteps the usual equipment tempo problem, where the cost to suit up arrives after the cost to cast. The sacrifice clause is what pays for it, and it reads less like a drawback than a redirection: in a deck stocked with disposable artifacts (Spellbomb shells, expended tokens, dead mana rocks), moving the Sledge from one body to the next costs you something you wanted to crack regardless. The interaction worth naming is the loop it invites with cards that reward artifacts dying, where reattaching becomes a sacrifice engine rather than just a way to keep a beater suited up. Strip the synergies away and it is still a clean swing: a three-mana equipment that hits play already buffing, turning a one-drop into a real clock without a second mana investment. The tension the design resolves is the one every aggressive equipment runs into, that mana spent equipping is mana not spent developing the board; Piston Sledge answers by changing the currency entirely, asking for artifacts instead of mana and trusting you brought enough fodder to feed it.