Dragonbroods' Relic (TDM) from Tarkir: Dragonstorm, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Racrufi
• Card Text:
  T, Tap an untapped creature you control: Add one mana of any color.
  3WUBRG, Sacrifice this artifact: Create a 4/4 Dragon creature token named Reliquary Dragon that's all colors. It has flying, lifelink, and "When this token enters, it deals 3 damage to any target." Activate only as a sorcery.