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.)

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Malady Invoker

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.

When this creature enters, you gain 3 life.
{6}: Transform this creature. Activate only as a sorcery. ( 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 this creature's power.