Defect, Cracked Core

At the start of your combat phase, Defect, Cracked Core deals 3 damage to target creature.

{t}: create a Plasma token (a colorless 0/1 artifact creature with {t}: gain {c})
{t}, {u}: create a Frost token (a blue 0/2 artifact creature with defender)
{t}, {x}{r}: create a Dark token (a red 0/{x} artifact creature with {t}: sacrifice this creature to deal {x} damage to target creature)