Herbology Instructor // Malady Invoker [MOM-189]

When Herbology Instructor enters the battlefield, you gain 3 life. {6}{B/P}: Transform Herbology Instructor. Activate only as a sorcery. ({B/P} can be paid with either {B} 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.