Artefatto — Equipaggiamento
Quando la Slitta a Pistoni entra nel campo di battaglia, assegnala a una creatura bersaglio che controlli.
La creatura equipaggiata prende +3/+1.
Equipaggiare—Sacrifica un artefatto.
You can sacrifice Piston Sledge to pay its own equip cost. It won't become attached as it will be in your graveyard.
If there are no creatures on the battlefield that Piston Sledge could be attached to when its "enters" triggered ability resolves, it remains on the battlefield unattached.