Mobile Garrison (AER) from Aether Revolt, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Cliff Childs
• Card Text:
  Whenever Mobile Garrison attacks, untap another target artifact or creature you control.
  Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)