Sunken RuinsHow it works & interactions with other cards

What It Does

Sunken Ruins offers two distinct mana abilities. First, it can be tapped to produce a single colorless mana, providing utility even if you do not have other colored mana sources available. Its primary strength, however, lies in its second ability: by paying one mana of either blue or black and tapping the land, you choose to produce two mana in any combination of those two colors (Blue-Blue, Blue-Black, or Black-Black).

How It Resolves Step by Step

To use the filtering ability, you must first have at least one blue or black mana available in your mana pool. When you activate the ability, you pay the cost of one blue or black mana and tap Sunken Ruins. As the ability resolves, you choose one of the three specific combinations provided by the oracle text. This mana is then added to your mana pool and can be used to pay for costs immediately.

Common Mistakes

A common error is assuming Sunken Ruins can produce colored mana on its own. It requires an initial investment of colored mana to 'filter' into a double-colored output; without that initial blue or black mana from another source, it only produces colorless mana. Additionally, remember that you cannot use the filtering ability to produce two colorless mana; it only creates the specific combinations of Blue and Black.

When to Play It

Sunken Ruins is ideal for decks that run cards with high density requirements, such as spells costing UUB or BB. It is especially effective when paired with other lands that produce multiple colors, as it helps 'unlock' the specific color combination you need for your hand. In formats like Commander, it is a staple for Dimir-aligned decks to ensure smooth transitions between turns.

Interaction examples

Filtering for Specific Spells

If you have Sunken Ruins and a source of Blue mana, you can tap the other source for Blue, then use that mana to activate Sunken Ruins. You can choose to add Black-Black to your pool, allowing you to cast a spell with a heavy black requirement even if you only started with one blue source.

Commander Color Identity

Command Tower

If your Commander is both Blue and Black, Command Tower can produce either color. You can tap Command Tower for Blue mana, then use that Blue mana to activate Sunken Ruins' second ability to produce two Black mana. This illustrates how Sunken Ruins acts as a force multiplier for your existing colored sources.

Mirroring Opponents' Mana

Exotic Orchard

If an opponent controls a Swamp, your Exotic Orchard can produce Black mana. You can then tap Exotic Orchard for Black and use that mana to pay for the Sunken Ruins activation. This allows you to generate two Blue mana (UU) from Sunken Ruins, effectively using your opponent's access to Black mana to reach your own Blue requirements.