Rover Blades

Two lines of the same keyword stacked on one permanent is the tell: this is a Vehicle that carries double strike as its own creature and hands double strike to whatever it equips. Doubling the doubler is the conceit. Crew it and you have a 2/2 that swings for four; attach it to something bigger and that creature hits twice instead. The equip cost of is the restraint on the whole design, since doubling a large attacker's damage tends to end games on the spot; the card asks for real mana before it pays out. The genuinely interesting piece is the type line. An Equipment that is also a Vehicle wants two contradictory things at once: Equipment need a host, Vehicles want to be crewed and attack alone. This one picks a role each turn. That is also where the crew clause's reminder text does its quiet work: "Creatures can't be attached to other permanents" means the moment you crew the Vehicle and it becomes a creature itself, it drops off whatever it was attached to. It cannot both be an attacking creature and be equipped to another attacker; you commit it to one job at a time. The strategic question is narrow and repeats every combat step: which of your creatures, the Vehicle included, most wants to strike twice this turn.