Build a Reliable Mana Base
A strong mana base turns good hands into playable games. It gives early spells the colors they need. It also supports late plans without flooding too often. This calculator compares land count, colored sources, and cards seen by a chosen turn. You can test a fast aggro list, a midrange pile, or a slower control deck.
Why Source Counts Matter
Many deck builders only count lands. That misses the real question. A spell with double blue on turn two needs enough blue sources, not just enough lands. Multicolor decks also need balance. One color may be a splash. Another may appear in every opening play. The source gap column helps show which colors need more support.
Reading the Results
The land drop chance estimates whether you will see the lands needed by the target turn. Each color chance estimates whether enough sources appear in those cards. The combined score blends those odds with untapped access. It is an approximation, because real lands may produce several colors at once. Still, the score is useful for comparing drafts of the same deck.
Tuning Suggestions
Raise land count when the land drop chance is low. Add dual lands, fetch lands, or basics when a color has a large gap. Reduce tapped lands if your early turns require speed. A deck with cheap interaction should value untapped sources more. A deck with many draw spells can sometimes keep slightly lower raw land counts.
Practical Deck Building
Use the target consistency field as a quality bar. Competitive lists often aim high for key colors. Casual lists may accept more risk. Always compare the result with playtesting. The calculator cannot know every mulligan, tutor, treasure, or modal land. It gives a structured check before games begin. After testing, update the numbers and see which change improved the score.
Common Adjustments
For two color decks, start with even access, then favor the color used earlier. For three color decks, avoid treating every splash as equal. Give main colors enough sources first. Lands that enter tapped are still sources, but they may fail an early play. Separate raw access from speed when the opening turns matter.
Review sideboard needs before final land choices.