Ticking Gnomes (EMA) from Eternal Masters, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Wayne Reynolds
• Card Text:
  Echo 3 (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
  Sacrifice Ticking Gnomes: Ticking Gnomes deals 1 damage to target creature or player.