Peacewalker Colossus (AER) from Aether Revolt, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Vincent Proce
• Card Text:
  1W: Another target Vehicle you control becomes an artifact creature until end of turn.
  Crew 4 (Tap any number of creatures you control with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.)