Herbology Instructor // Malady Invoker is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
When this creature enters, you gain 3 life.: Transform this creature. Activate only as a sorcery. (
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.
Complete guide
Herbology Instructor is a versatile double-faced card that balances early-game survival with late-game removal. This Treefolk Druid provides a helpful life buffer when it arrives, only to later transform into a Phyrexian threat capable of weakening the strongest enemies. Knowing when to pay life or mana to transform this creature is key to mastering its dual nature.
A Lifegiving Entrance
When Herbology Instructor enters the battlefield, its triggered ability immediately goes on the stack to grant you 3 life. This helps stabilize your total, especially if you plan to use your life as a resource later. Because this is an 'enters' trigger, it occurs regardless of whether the spell was cast or put onto the battlefield through other means.
The Transformation Process
To turn this instructor into the Malady Invoker, you must pay its transformation cost of six mana plus one Black Phyrexian mana. You can pay this last mana with either one Black mana or 2 life. This ability is restricted to sorcery speed, meaning you can only activate it during your own main phase when the stack is empty. Once the ability resolves, the physical card is flipped to its back face.
Invoking the Malady
The moment it transforms into Malady Invoker, a new triggered ability targets an opponent's creature. This ability applies a toughness reduction of -0/-X, where X is Malady Invoker's current power. The value of X is determined at the moment the ability resolves. If Malady Invoker is removed from the battlefield before the ability resolves, the game uses its 'last known information' to check what its power was right before it left.
Interaction examples
Llanowar ElvesIf you have Llanowar Elves on the battlefield, you can use its mana to help pay the transformation cost. Once Herbology Instructor transforms, the Malady Invoker ability triggers. If you have a way to increase Malady Invoker's power (such as an equipment or an aura) before that ability resolves, the value of X will increase, allowing you to shrink a larger enemy creature.
Birds of ParadiseTransforming the Instructor requires a specific Phyrexian Black mana. If you are playing a Green deck without Black mana sources, Birds of Paradise can tap to produce the Black mana required. This allows you to transform the creature without spending 2 life, preserving your life total for other strategic needs.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Herbology Instructor // Malady Invoker
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Use Malady Invoker’s power as its ability resolves to determine the value of X. If Malady Invoker is no longer on the battlefield at that time, use its power when it was last on the battlefield.
No other card is named in this ruling.
Legal formats
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Meta decks with Herbology Instructor // Malady Invoker
No archived Top 8 deck with this card yet.