Stenn, Paranoid Partisan — ruling 1

The cost reduction applies only to generic mana in the cost of spells you cast of the chosen card type.

Stenn, Paranoid Partisan — ruling 2

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Stenn's second ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.

Stenn, Paranoid Partisan — ruling 3

If Stenn's controller activates its last ability during a player's end step, the delayed triggered ability that returns it to the battlefield won't trigger until the next time an end step begins, usually during the next player's turn.

Stenn, Paranoid Partisan : règles, fonctionnement et interactions (MTG)

Stenn, Paranoid Partisan 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

As Stenn enters, choose a card type other than creature or land. Spells you cast of the chosen type cost less to cast. : Exile Stenn. Return it to the battlefield under its owner's control at the beginning of the next end step.

Complete guide

Stenn, Paranoid Partisan is a versatile legendary wizard from Dominaria United that provides a permanent cost reduction for a specific category of spells. By choosing a card type upon entry and offering a way to flicker itself, Stenn can adapt to your deck's needs or protect itself from removal. This card is an excellent tool for control and combo decks looking to maximize mana efficiency.

Choosing Your Advantage

As Stenn enters the battlefield, you must choose a card type that is not a creature or a land. Common choices include Artifact, Instant, Sorcery, Enchantment, Planeswalker, or Kindred. Once chosen, every spell you cast of that specific type costs {1} generic mana less to cast. Note that this reduction only affects generic mana; it cannot reduce the colored mana requirements of a spell.

Resolving the Blink Ability

Stenn features a tactical activated ability for {1}{W}{U} that exiles it and returns it to the battlefield at the beginning of the next end step. When Stenn returns, it is treated as a new object. This means you get to choose a new card type (or the same one) as it enters. If you activate this ability during an end step, Stenn will stay in exile until the next turn's end step begins.

Common Pitfalls

A frequent mistake involves trying to reduce the cost of artifact creatures. Even if you choose 'Artifact,' Stenn's ability specifies you must choose a card type 'other than creature or land.' Because an artifact creature is still a creature, it does not benefit from the reduction. Additionally, remember that the total cost of a spell is calculated by starting with the base cost, adding increases, and finally applying Stenn's reduction.

Strategic Timing

Use Stenn's exile ability to dodge board wipes or targeted removal. Because the return trigger happens at the beginning of the next end step, you can safely remove Stenn from the board in response to a spell and have it return after the spell has resolved. This also allows you to pivot your strategy if you need to switch from reducing the cost of Instants to reducing the cost of Artifacts.

Interaction examples

The Artifact Creature Restriction

Esper Sentinel

Ornithopter of Paradise

If you choose 'Artifact' as Stenn, Paranoid Partisan enters the battlefield, you might expect Esper Sentinel or Ornithopter of Paradise to cost less. However, since both are creatures, they are ineligible for the reduction. Stenn specifically excludes the 'creature' type, so any spell that has 'creature' on its type line will not have its cost reduced, even if it shares another type you chose.

Flickering for Flexibility

Suppose you chose 'Instant' early in the game to keep your counterspells cheap. Later, you draw several expensive artifacts. You can pay {1}{W}{U} to exile Stenn. When it returns at the end step, you can choose 'Artifact' to shift your mana advantage toward your new game plan, demonstrating Stenn's adaptability as a mana dork.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : Stenn, Paranoid Partisan

Original English text — Wizards of the Coast / Scryfall

#1September 9, 2022· Wizards of the Coast
The cost reduction applies only to generic mana in the cost of spells you cast of the chosen card type.
No other card is named in this ruling.
#2September 9, 2022· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Stenn's second ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
No other card is named in this ruling.
#3September 9, 2022· Wizards of the Coast
If Stenn's controller activates its last ability during a player's end step, the delayed triggered ability that returns it to the battlefield won't trigger until the next time an end step begins, usually during the next player's turn.
No other card is named in this ruling.