Herbology Instructor // Malady Invoker (MOM-189) - March of the Machine

When Herbology Instructor enters the battlefield, you gain 3 life.
{B/P}: Transform Herbology Instructor. Activate only as a sorcery. ({B/P} can be paid with either or 2 life.)

When this creature transforms into Malady Invoker, target creature an opponent controls gets -0/-X until end of turn, where X is Malady Invoker's power.