Mishra's Factory (B) (ATQ) from Antiquities, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Kaja Foglio & Phil Foglio
• Card Text:
  Tap to add 1 colorless mana to your mana pool or give any Assembly Worker +1/+1 until end of turn.1: Mishra’s Factory becomes an Assembly Worker, a 2/2 artifact creature, until end of turn. Assembly Worker is still considered a land as well.