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Filter lands can refer to two different sets of dual lands.[1] Their name describes the ability to take one mana and turn it into a combination of two colored mana. Some lower powered and older filter lands can generate more color but don't generate net mana, making them generally poor but lower rarity mana fixers.

Original filter lands[ | ]

Allied colored from Odyssey[ | ]

The original filter lands were a cycle of lands that appeared in Odyssey. They each have an activation cost of {1} and produce two mana of different colors of an allied color pair. While better than some filter lands due to being mana-positive, the inability to tap for {C} mana meant that they could leave a player stranded without mana.

Enemy colored from Fallout[ | ]

Twenty-three years after the introduction of the original filter lands, the cycle was completed with the printing of the remaining five enemy color filter lands in Fallout.[2]

Shadowmoor/Eventide filter lands[ | ]

Newer filter lands were previewed in Future Sight. The cycle of ten dual lands was finished in the sets Shadowmoor and Eventide. In Shadowmoor the cycle of allied-colored lands was printed, while Eventide had the cycle of enemy-colored lands. They each take one mana of two possible colors and produce two mana of any combination of the two colors that can be paid. They can also tap for {C} mana, avoiding the above issue. They were reprinted in Oath of the Gatewatch: Zendikar Expeditions and Double Masters

Allied colored from Shadowmoor[ | ]

Enemy colored from Eventide[ | ]

Ravnica Signets[ | ]

During Ravnica block a cycle of ten Mana Stones were printed which have abilities similar to the original filter lands. These artifacts cost {2} to cast and can be tapped to filter {1} into two mana of two different colors.

Allied colored[ | ]

Enemy colored[ | ]

Original triple lands[ | ]

The earliest triple land cycle from Homelands which produces three colors of mana conditionally as follows:

{T}: Add {C}.
{1},{T}: Add M.
{2},{T}: Add N or O.

where N and O are the allied colors of M.

By a looser definition, much like some of the lands listed below, these too are filter lands but are strictly worse than several of them.

Rainbow filter lands[ | ]

Introduced in Lorwyn, Shimmering Grotto has the ability "{1}, {T}: Add one mana of any color." alongside tapping for {C}, making them strictly better than older filter lands School of the Unseen and Henge of Ramos. This pair of abilities is the most common filter land template, and with reprints (plus Unknown Shores, which has one more premier set printing) turn up often in sets as a bad mana fixer where Evolving Wilds is potentially too useful. Newer common versions experiment with other minor upsides. The following lands follow this template, with the rare ones having a powerful secondary ability.

Common[ | ]

Rare[ | ]

Other filter lands[ | ]

There are a few other filter lands that don't belong in any cycle:

References[ | ]

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