Colorless

In Magic: The Gathering, colorless has two in-game meanings. It is either a type of objects or a type of mana. Note that colorless is not a color, and is not represented in the color wheel. 
==Colorless objects==
An object (a card or spell) with no colored mana symbols in their mana costs is colorless. Lands, having no mana costs, are always colorless by default, with the sole exception of the color-indicated. Artifacts are the most common colorless spell, and Eldrazi creatures were made colorless to mark them as alien, with multiple associated noncreature spells. Karn and Ugin are colorless planeswalkers. In Strixhaven: School of Mages, several colorless Sorceries were printed as first-year introduction spells, in contrast to the colored school faculties. 
Colorless gets access to pretty much everything, but at inefficient mana costs. For example, the destruction of permanents costs a minimum of .
Devoid is a characteristic-defining keyword ability that states that a card is colorless, regardless of the colors in that card's mana cost. All devoid cards are from Battle for Zendikar block and Modern Horizons 3.
Colorless cards come before colored cards in collector number, in contrast to artifacts and lands, which are numbered at the end of the set. Colorless cards which aren't artifacts or lands feature a transparent frame, allowing the art to run all the way to the border.
==Colorless mana==
Colorless mana () has no color.
===History===
The idea of colorless mana was already introduced in Alpha with <c>Basalt Monolith</c>, <c>Mana Vault</c>, and <c>Sol Ring</c>. It set the premise that most mana comes in one of the five colors (white, blue, black, red, or green), but there is a sixth subset of mana that is not any color. This mana could only be used to pay for costs that don't require color (for example artifacts).
In early sets, the text for <c>Sol Ring</c> was still spelled out as "Add 2 colorless mana to your mana pool". However, from Onslaught onwards, this was officially changed for editing reasons to "Add to your mana pool".
The cost of many cards includes generic mana (e.g., , ), meaning that a player can use that number of any mana (colored or colorless) to pay for it. Though one can use colorless mana to pay for generic mana costs, they are not the same thing. Generic is a type of cost, whereas colorless is a type of mana; a player cannot produce generic mana and, originally, there were no colorless costs. The latter changed with Oath of the Gatewatch. 
R&D concluded that they had to stop using the mana circle with a number to represent both generic and colorless mana. Changing the representation of colorless mana was easier, as it's represented far less, so they decided to make the new mana symbol that represents one colorless mana. In our example the text for <c>Sol Ring</c> now is "Add ". One of the consequences of introducing a colorless mana symbol was the change to over 300 cards in Oracle, the central database of official card wordings.
===Colorless mana cost===
While adding colorless mana to your mana pool is an evergreen mechanic, colorless mana costs are not. Mana costs that can only be paid with colorless mana were first introduced in Oath of the Gatewatch and have only appeared since (outside of reprints) in the Eldrazi Unbound Commander Masters deck and in Modern Horizons 3. 
In the vision design of The Brothers' War, R&D did spend some time talking about whether they wanted to use colorless mana as a cost (similar to Oath of the Gatewatch). They even went so far as to explore the idea of having fifteen draft archetypes with colorless mana filling the role of a sixth "color." In the end, it just didn't feel right.
==Rules==
==References==