Mina Ashido, Acid Queen

Flash
When Mina Ashido, Acid Queen enters the battlefield, target creature an opponent controls
gets -0/-X until end of turn, where X is your
devotion to black. (Each {b} in the mana costs of permanents you control count as your devotion to
black)
{2}{b}: Mina Ashido, Acid Queen has deathtouch
until end of turn.