Emeralda, Angel of Humanity

Flying, Vigilance

Activated abilities that are not mana abilities you activate have split second.

{3},{t}: Deal 3 damage to any target. If only blue mana was used to activate this ability, tap all creatures target player controls. If only white mana was used to activate this ability creatures and planeswalkers target player control cannot activate abilities until the beginning of your next run. If only black mana was used to activate this ability put a
-1/-1 counter on each creature that player