Sulfurous Mire — ruling 1

Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.

Sulfurous Mire — ruling 2

The {S} symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.

Sulfurous Mire — ruling 3

Snow isn't a type of mana. If an effect says you may spend mana as though it were any type, you can't pay for {S} using mana that wasn't produced by a snow source.

Sulfurous Mire — ruling 4

Some cards have additional effects for each {S} spent to cast them. You can cast these spells even if you don't spend any snow mana to cast them; their additional effects simply won't do anything.

Sulfurous Mire — ruling 5

The Kaldheim set doesn't have any cards with mana costs that include {S}, but some previous sets do. If an effect says such a spell costs {1} less to cast, that reduction doesn't apply to any {S} costs. This is also true for activated abilities that include {S} in their activation costs and effects that reduce those costs.

Sulfurous Mire : règles, fonctionnement et interactions (MTG)

Sulfurous Mire 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

(: Add or .) This land enters tapped.

Complete guide

Sulfurous Mire is a versatile dual land from the Kaldheim expansion that provides both Black and Red mana while supporting snow-based strategies. As a land with basic land types, it integrates seamlessly into decks that care about both color fixing and the snow supertype.

Dual Types and Tapped Entry

Sulfurous Mire possesses the Swamp and Mountain subtypes, meaning it can be found by effects that search for basic land types. To balance its ability to produce two different colors of mana, it enters the battlefield tapped, requiring players to plan their turns one step ahead.

The Power of the Snow Supertype

Because this land has the Snow supertype, any mana produced by its activated ability is considered mana from a snow source. This mana can be used to pay for generic costs or specific snow mana symbols ({S}) found on other cards. Note that 'Snow' is not a color or a type of mana, but a property of the source that generated it.

Interaction with Fetching and Color Identity

Since it is a Swamp Mountain, it is subject to rules governing those types. In Commander, its color identity is Black and Red. It will also contribute to the count of lands you control for any abilities that check for the number of Swamps or Mountains on your battlefield.

Interaction examples

Generating Snow Mana

You tap Sulfurous Mire for either {B} or {R}. If you have an ability that requires {S} (snow mana) to activate, the mana produced by Sulfurous Mire satisfies that requirement because the land itself is a snow source.

Fixing with Command Tower

Command Tower

If your Commander's color identity includes Black and Red, both Sulfurous Mire and Command Tower can provide the colors you need. While Sulfurous Mire enters tapped, it provides the added benefit of being a snow source, which Command Tower is not.

Opponent Interaction with Exotic Orchard

Exotic Orchard

If you control Sulfurous Mire and an opponent controls Exotic Orchard, the opponent can tap their Exotic Orchard for either {B} or {R}. However, the mana produced by Exotic Orchard will not be snow mana because Exotic Orchard itself does not have the Snow supertype, even though the land it is 'copying' does.

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

How it works : Sulfurous Mire

Original English text — Wizards of the Coast / Scryfall

#1February 5, 2021· Wizards of the Coast
Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.
No other card is named in this ruling.
#2February 5, 2021· Wizards of the Coast
The symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.
No other card is named in this ruling.
#3February 5, 2021· Wizards of the Coast
Snow isn't a type of mana. If an effect says you may spend mana as though it were any type, you can't pay for using mana that wasn't produced by a snow source.
No other card is named in this ruling.
#4February 5, 2021· Wizards of the Coast
Some cards have additional effects for each spent to cast them. You can cast these spells even if you don't spend any snow mana to cast them; their additional effects simply won't do anything.
No other card is named in this ruling.
#5February 5, 2021· Wizards of the Coast
The Kaldheim set doesn't have any cards with mana costs that include , but some previous sets do. If an effect says such a spell costs less to cast, that reduction doesn't apply to any costs. This is also true for activated abilities that include in their activation costs and effects that reduce those costs.
No other card is named in this ruling.