Stern Lesson 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
Draw two cards, then discard a card. Create a tapped Powerstone token. (It's an artifact with ": Add
. This mana can't be spent to cast a nonartifact spell.")
Complete guide
Stern Lesson is a versatile blue instant from The Brothers' War that combines card filtering with valuable resource acceleration. By providing both a fresh hand and a Powerstone token, it bridges the gap between early-game setup and late-game artifact powerhouses.
What Stern Lesson Does
For three mana, Stern Lesson allows you to draw two cards and then discard one from your hand. Immediately following the discard, you create a Powerstone token that enters the battlefield tapped. This token is a specific predefined artifact that taps for one colorless mana, which carries a restriction: it cannot be used to cast nonartifact spells.
Step-by-Step Resolution
When Stern Lesson resolves, you follow the instructions in order. First, you draw two cards. Second, you choose any one card from your hand and put it into your graveyard. Finally, you place a Powerstone token onto the battlefield tapped. Because the token enters tapped, you generally cannot use its mana on the same turn you cast Stern Lesson unless you have a way to untap it.
Spending Powerstone Mana
A common mistake is thinking Powerstone mana can only be spent on artifact cards. In reality, you can use it for any cost that isn't a nonartifact spell. This includes activated abilities of creatures or enchantments, triggered costs like Ward, or even costs to flip cards. The only thing you strictly cannot do is spend it to cast a spell that lacks the 'Artifact' type.
Strategic Timing
As an instant, Stern Lesson is best played on your opponent's end step. This allows you to keep your mana open for reactive plays. If your opponent doesn't play anything worth countering, you can safely cast this to refine your hand and set up your mana for the following turn.
Interaction examples
CounterspellIf you hold up mana for Counterspell but your opponent doesn't cast a threat, you can cast Stern Lesson right before your turn starts. You draw two cards, discard one, and gain a Powerstone. On your next turn, that Powerstone will be untapped and ready to help pay for artifacts or activated abilities.
Powerstone
Arcane DenialSuppose you have an untapped Powerstone token and want to cast Arcane Denial. Since Arcane Denial is an Instant and not an Artifact, you cannot use the mana from the Powerstone to pay for its mana cost. You must use regular lands or other mana sources for nonartifact spells.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Stern Lesson
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Powerstone tokens are a kind of predefined token. Each one has the artifact subtype "Powerstone" and the ability "
: Add . This mana can't be spent to cast a nonartifact spell."Card named in this ruling
- #2· Wizards of the Coast
You can use the
added by a Powerstone token on anything that isn't a nonartifact spell. This includes paying costs to activate abilities of both artifact and nonartifact permanents, paying ward costs, and so on.Card named in this ruling
- #3· Wizards of the Coast
Although all the cards in The Brothers' War that create Powerstone tokens create a tapped Powerstone token, entering the battlefield tapped isn't part of the token's definition. Notably, if you create a token that is a copy of a Powerstone token, the token copy won't enter the battlefield tapped.
Card named in this ruling
Related cards and tokens
Legal formats
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Meta decks with Stern Lesson
No archived Top 8 deck with this card yet.