Brass Knuckles

The double strike is the payoff, but the copy trigger is the engine. Cast this and you get two Equipment off one card: the original permanent plus a token copy, which means the "two or more Equipment attached" clause is designed to be satisfiable by this card alone. Equip both to the same creature and it hits twice. That self-enabling loop closes the gap that has always dogged Equipment: most gate a keyword behind other pieces you have to draw and cast separately, while this one ships its own second body in the same spell. The friction lives in the equip math: two attaches at one mana each on top of the four to cast makes the fastest all-in-one turn expensive, and the sorcery-speed equip restriction locks the whole assembly out of combat tricks and end-step surprises. What you build instead is a durable board that the copy quietly widens: nothing stops you from splitting the original and its token across separate creatures for other equip-count payoffs, or stacking a third and fourth piece onto whatever wants a crowded gear slot. Copy effects on the stack usually reward instants and cheap burn; wiring one onto a permanent that persists after the copy resolves is the less obvious use of the mechanic, and it is what makes this a token generator wearing an Equipment's frame.