The weakest castle in Heroes of Might and Magic IV!

Well, if you spend all your time hiding in your castle, you'll still have more time to develop your hero, acquire more mines, or castles. Also, don't forget that angels move first and can fly far, while the Mage of Haven isn't a bodybuilder. Your only chance (but it's a pretty good one) is to develop quickly and attack the enemy's castle before the Life faction gets its guardians and angels. Thanks to its nobility, you'll develop faster and have a larger army. And if you compare spells up to level 3, Haven is undoubtedly superior. Hiding in a castle, I think, is not the best tactic for this faction (especially in PvP games).