Cassiopeia, Serpent's Embrace

Allegiance - Shurima (Tap this card to help cast a creature with Allegiance - Shurima. This pays for {1} or one mana matching this card's identity.)
{b/g}, {t}: Place a -1/-1 counter on target creature.
{b}{g}, {t}: Tap target creature. It doesn't
untap during its controller's next untap step.