Maturation Chamber (TRC) from Star Trek Commander, available at 401 Games Canada.

• Set: Star Trek Commander
• Rarity: Rare
• Finish: Normal
• Card Type: Artifact
• Colour: White
• Mana Value: 2
• Artist: Jonas De Ro
• Card Text: Whenever you cast an artifact spell, put a charge counter on this artifact.
  4, T: Create a 1/1 colorless Borg artifact creature token for each charge counter on this artifact. Activate only as a sorcery.