Mishra's Factory (EMA) from Eternal Masters, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Scott Chou
• Card Text:
  T: Add C to your mana pool.
  1: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
  T: Target Assembly-Worker creature gets +1/+1 until end of turn.