Underhanded Designs (KLD) from Kaladesh, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Anastasia Ovchinnikova
• Card Text:
  Whenever an artifact enters the battlefield under your control, you may pay 1. If you do, each opponent loses 1 life and you gain 1 life.
  1B, Sacrifice Underhanded Designs: Destroy target creature. Activate this ability only if you control two or more artifacts.