Threnody Singer (THB) from Theros Beyond Death, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: PINDURSKI
• Card Text:
  Flash
  Flying
  When Threnody Singer enters the battlefield, target creature an opponent controls gets -X/-0 until end of turn, where X is your devotion to blue. (Each U in the mana costs of permanents you control counts toward your devotion to blue.)