A perfectly built spell list means nothing if the mana base underneath it cannot reliably produce the right colors on time. Color screw, drawing lands that don't match the spells stuck in hand, is one of the most common ways a good deck loses a game it should have won.
Mana fixing is the umbrella term for any card or land that helps smooth out a multicolor manabase, from dual lands that produce two colors to mana rocks and ramp spells that add whatever color is needed. Getting fixing right is often the difference between a deck that works and one that only works on paper.
The more colors a deck runs, the more this problem compounds, which is exactly why two-color decks are considered far more forgiving to build than three or more colors without serious fixing support.
This guide covers what color screw actually looks like, the main categories of mana fixing available, and how to build a manabase that holds up under real game conditions.
Color screw happens when a player draws lands that produce the wrong colors for the spells sitting in their hand, effectively stranding real cards behind a mana base that cannot cast them. It's distinct from simple mana flood or mana screw, which are about having too much or too little mana overall rather than the wrong colors of it.
The problem gets worse the more colors a deck runs and the more color-intensive its spells are, since a card with two pips of the same color in its cost needs that specific color reliably by a certain turn, not just any mana at all.
Dual lands, which produce two colors of mana from a single land, are the most direct fix for color screw, since they reduce the number of single-purpose lands a deck needs to include. Premium dual lands that enter untapped and carry no drawback are the gold standard, though they're often the most expensive lands in the game.
Budget-friendly alternatives like tapped dual lands or lands that enter untapped only under a specific condition still meaningfully reduce color screw, just with a real cost in tempo that has to be weighed against a deck's actual speed.
Mana rocks like Signets add a specific color or combination of colors regardless of what basic lands a player has actually drawn, making them one of the most reliable fixing tools available, especially in Commander where a five-color commander might need every color at once.
Ramp spells that search for a specific type of land, like Rampant Growth or Cultivate, do double duty as fixing, since a player can search specifically for whatever color is missing rather than just adding generic mana.
Fetch lands, which sacrifice themselves to search the library for a land with a specific type, are some of the most flexible fixing tools in the game because they let a player wait until they know exactly which color they're missing before committing. This flexibility is part of why fetch lands remain expensive and heavily played across constructed formats.
Fetch lands also interact well with shock lands and other dual lands that share a basic land type, since a single fetch can search up any of several different dual lands depending on what a deck actually needs that turn. Fetch lands especially hold their value, so a EVORETRO Toploader is worth keeping them in when they're not actively in a deck.
As a rough guideline, two-color decks are generally forgiving enough to build with a modest number of dual lands, while three-color decks need real fixing investment to avoid regular color screw. Four and five-color decks, outside of dedicated Commander shells, usually require a manabase built almost entirely around fixing rather than basic lands.
This is a big part of why so many constructed decks stick to two colors even when a three-color build looks appealing on paper, since the fixing cost of supporting a third color often isn't worth the extra card options it unlocks.
The most reliable approach is to plan a deck's fixing before finalizing its spell list, counting how many sources of each color are actually needed based on how early and how often a given color's spells need to be cast. A splash color used for just a couple of cards needs far fewer sources than a deck's primary color.
Testing a manabase across several sample hands before locking it in also catches color screw problems early, since a manabase that looks fine on paper can still produce an uncomfortable number of unplayable opening hands in practice. Once the manabase is dialed in, keep the finished deck together in a EVORETRO Plastic Deck Box so the fixing lands stay with the deck they belong to.
Drawing lands that don't match the colors of the spells in hand.
Mana rocks like signets, since they add specific colors regardless of what lands are drawn.
Two colors comfortably, three with real fixing investment, four or five usually only with heavy fixing support.
Yes, since they let a player wait to search for whichever color is actually missing.
Duals, fetches, and signets all deserve the same protection as your bombs, so keep them crisp in a pack of EVORETRO Toploaders the moment they come out of a booster.
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