This tool is a method used by players of the Magic: The Gathering Commander format to estimate the relative strength of a deck. It involves assigning a numerical value, typically on a scale of 1 to 10, to represent how well a particular deck is expected to perform against others. For example, a deck designed for casual play might be rated a 4, while a highly optimized, competitive deck might be rated a 9 or 10.
The importance of this assessment lies in facilitating balanced and enjoyable gameplay experiences. It allows players to group decks of similar strength, mitigating the risk of one player dominating the game due to a significantly more powerful deck. Historically, it arose from the need for a common language among Commander players to gauge the power of their decks, especially in the absence of formal tournament structures and rankings common in other Magic: The Gathering formats.