Darius, Noxian Guillotine

At the start of each of your combat phases,
Darius, Noxian Guillotine deals 1 damage to all creatures you don't control.
{1}{r}: Target creature blocks Darius, Noxian Guillotine this turn if able.
{2}{b}: Destroy target creature blocking or blocked
by Darius, Noxian Guillotine.