Quote Originally Posted by Sockosensei View Post
Cavern of Souls is essential, even in 12-Post builds.
With MUD's inconsistency, we need every big-hitter we draw to resolve because we don't have easy ways to restock our hand in the mid- to late-game.

I've been running the following manabase with success:
4 Cloudpost
4 Glimmerpost
3 Vesuva
4 Cavern of Souls
4 Ancient Tomb
2 City of Traitors
3 Wasteland
It depends on your list. If you play a full set of Trinisphere's the Caverns are more or less redundant. Good luck keeping 3 mana open at all time to cast your daze of FOW...