Creature — Siren
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.)
1/3
Illustrated by PINDURSKI
Infrecuentes
Theros Beyond Death
Azul
Criatura