Herbology Instructor // Malady Invoker

Herbology Instructor {1}{G}

Creature — Treefolk Druid

When this creature enters, you gain 3 life. {6}{B/P}: Transform this creature. Activate only as a sorcery. ({B/P} can be paid with either {B} or 2 life.)

Malady Invoker

Creature — Phyrexian Treefolk

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.