Ah, mana fixing. In a set like Magic 2013 that saw a bunch of baffling reprints, such as Battle of Wits, Gilded Lotus is one of those cards you’ll never mind opening. It does cost 5 colorless mana to play, but it essentially only costs 2 because it immediately has the ability to give you three mana of any color.
It was a great color fixer back in the days of the Mirrodin Block (a few years before my time). It's also a very popular card in Commander, and has seen some fringe play in Modern Tron decks, as well. It’s a solid card. With its Dominaria printing, it's now far more available for those that want to use it as part of their mana ramp package.