Dabi, Esper of Shadows

Haste, exalted
{u},{t},Discard a blue card: Counter target noncreature spell.
{b},{t},Discard a black card: Destroy target
creature.
{1}{r},{t},Discard a red card: Dabi, Esper of
Shadows deals 4 damage to any target.
If there are at least four colors amongst
permanents in your graveyard, transform Dabi,
Esper of Shadows.