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.)
//
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.