Tainted land

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Tainted lands are a 4-card cycle of dual lands. 
They tap for one colorless mana. If the player controls a Swamp, they can also tap for either or a second color that depends on the individual card.
==Examples==
==History==
Tainted lands were introduced early 2002 in Torment as part of its "swamp reward" theme, as this set was specifically centered around black.
Each card has since been reprinted in a special set: <c>Tainted Isle</c> in Planechase 2012, <c>Tainted Field</c> in Duel Decks: Sorin vs. Tibalt, <c>Tainted Wood</c> in Duel Decks: Jace vs. Vraska, and <c>Tainted Peak</c> in the Planar Portal Forgotten Realms Commander Deck. Both <c>Tainted Field</c> and <c>Tainted Wood</c> also got reprinted with new frame in Commander 2015 and Commander 2021. Additionally, Tainted Field appeared in Explorers of Ixalan, and Tainted Isle appeared in the Undead Unleashed Midnight Hunt Commander Deck.
==List of tainted lands==
*<c>Tainted Field</c> (/)
*<c>Tainted Isle</c> (/)
*<c>Tainted Peak</c> (/)
*<c>Tainted Wood</c> (/)
==Notes==
*Tainted lands work with nonbasic lands that have the swamp subtype, like <c>Leechridden Swamp</c> or <c>Watery Grave</c>.
*Check lands are another cycle of lands that provide an upside if the player controls a land of a particular type. They enter the battlefield untapped if the condition is met.
*Verge lands are a closer and clearly better version of the Tainted lands; they produce colored mana like a basic would and gain the ability to add a second color if either of the two matching types are controlled. The four black Verges (<c>Bleachbone Verge</c>, <c>Wastewood Verge</c>, <c>Blazemire Verge</c> and <c>Gloomlake Verge</c>) are hence strictly better versions their respective Tainted lands.
==Trivia==
*The tainted land cycle is unique in that it centers around all possible color combinations with one particular color — black. Each other dual land cycle in existence centers around either allied colors or enemy colors.
**As of yet no cycles for any of the other basic land types has been printed.
*They are also the only uncommon dual lands with the potential to consistently produce colored mana, as opposed to cycles like nap lands or storage duals.
*The artwork of each tainted land is based on that of a respective basic land from Odyssey, representing a darker version of the original. 
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==References==