Originally Posted by
ESG
Mana flooding can occur in any deck. 25 lands is the commonly accepted number, based on extensive tournament play. Your curve and land count can be adjusted slightly up or down based on the cards you run in the flex slots or the sideboard. In general, though, keep these things in mind:
1) This deck has a high curve. You can't keep one-landers and you need to be able to play your spells even after a Wasteland. Three lands + four spells or four lands + three spells is a solid keep in the dark. Chalice of the Void or Thalia are your preferred Turn 1 plays, and you want to make land drops for your first three or four turns.
2) This deck is mana-hungry. Extra mana is beneficial with Eldrazi Displacer, equpping equipment, activating Stoneforge, rebuying Batterskull, holding up Karakas to save a Thalia, etc.
3) Thalia, Guardian of Thraben is symmetrical, so in some matchups you'll be playing more cards that you'll be taxed on, raising your mana curve slightly. Again, a higher land count is beneficial.