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

• Rarity: Rare
• Finish: Normal
• Artist: Val Mayerik
• Card Text:
  Echo (During your next upkeep after this permanent comes under your control, pay its casting cost or sacrifice it.)
  Citanul Centaurs cannot be the target of spells or abilities.