Metrognome (USG) from Urza's Saga, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Jeff Laubenstein
• Card Text:
  When a spell or ability one of your opponents controls causes you to discard Metrognome, put four Gnome tokens into play. Treat these tokens as 1/1 artifact creatures.
  4, T: Put a Gnome token into play. Treat this token as a 1/1 artifact creature.