This tool analyzes your deck to calculate the color ratio, density, and complexity of your card's mana costs in order to determine the weighted ratio of colored and dual lands you should use. It also offers a rough guess for your "minimun-safe" dual land ratio, meaning the minumum rate of two-color lands you could possibly get away with.
This tool is a great place to start when first creating the mana base for a new deck, but you should always exercise your own judgment. The tool can't know everything, and playtesting is always the best method for final determination. In the end, this is just a good beginning.
To use this tool, simply input your nonland cards below in normal deck format and hit submit. Vrgrb will take care of the rest.
Note: Vrgrb assumes you actually want to cast all of your cards, so if there are cards you have no plans of casting (Force of Will), leave them off of your list.
Your deck's general color ratio is below. This value gives you the rough guidelines of how your deck's colored mana compares to eachother. This can be a rough shot from the hip for your general land color ratio, but takes nothing but general color into consideration.
Density & Complexity
Your deck's color density and color complexity are measurements of how intense each color's representation is per-card, leveled across the deck. Even when ran in low numbers, cards with repeating color symbols on them drive your deck's desire to devote more of its land base to that color.
By modifying the General Ratio by Color Densities and Complexities, we arrive at a more accurate depiction of the color-needs of the deck. The Weighted Ratio is an accurate depiction of how your landbase should be partitioned. Without dual lands, this directly translates to basic land ratios.
Complexity and Density
Now that we have determined the weighted ratios, we can look at your deck's overall complexity and density. These values, when combined with your weighted ratios, determine the deck's colors-per-land requirements and offer us a very rough "minimum-safe" dual land rate.