Executioner's Guillotine

When Executioner's Guillotine enters the battlefield choose a creature type.
{4}, {t}: Destroy target creature of the chosen type. Activate this only as a sorcery.
The executioner was silent, none knew his name, but all feared him. Little known was that he was a humble man with the gentlest of souls. This is how he made coin, and bought food for his sick wife.