Buy @ TCGplayer
Vehicles you control become artifact creatures until end of turn. Choose a Dwarf you control. Attach any number of Equipment you control to it.
The set of Vehicles affected by Armed and Armored is determined as the spell resolves. Vehicles you begin to control later in the turn won't automatically become creatures.
You can cast Armed and Armored even if you don't control any Vehicles or Dwarves. Whatever part of the effect that can happen does, and the rest is ignored.
