A good formula for the number of lands in your 99-card deck, counting MDFCs partially in this fashion, is: 31.42 + 3.13 * average mana value of your spells – 0.28 * number of cheap card draw or mana ramp spells.This means that if your average mana value is three, which is fairly typical, then you should start with 25 or 26 lands and cut one land for every three or four cheap card draw or mana ramp spells in your deck. A good formula for the number of lands in your 60-card deck, counting MDFCs partially in this fashion, is: 19.59 + 1.90 * average mana value of your spells – 0.28 * number of cheap card draw or mana ramp spells + 0.27 if you have a companion.A mythic land/spell MDFC, such as Emeria’s Call, counts as 0.74 land. A non-mythic land/spell MDFC, such as Jwari Disruption or Kazandu Mammoth, counts as 0.38 land.In this article, based on a regression analysis of over 95,000 successful tournament decks, I will provide useful formulas that can help you choose the numbers of lands for your deck. But how much do you need, and how does this depend on the composition of your deck? Nowadays, recognizing the danger of mana screw, decks often contain far more lands. But deck building insights have made great strides since then. Back in the ’90s, I often heard the recommendation to build a deck with a third creatures, a third noncreature spells and a third lands.

Ever since the release of the first Magic set, deck builders have been captivated by the question of how many lands to play.

Mtg decked builder