Flash (You may cast this spell any time you could cast an instant.)Flying (This creature can't be blocked except by creatures with flying or reach.)
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 in the mana costs of permanents you control counts towards your devotion to blue.).
Vintage
Standard
in the mana costs of permanents you control counts towards your devotion to blue.)