Mana Confluence is a usually superior alternative to City of Brass (better against Rishadan Port, but worse in combination with, say, Phyrexian Unlife). Theros and Born of the Gods have a few corner-case Legacy playables between them. This set hasn't even been spoiled yet, but it already clearly has some, on top of thematically taking the enchantment theme further than the previous sets. Very cool.