It gives you ways to make fun bluffing plays (more on that here) and is entirely combat-focused, both elements that improve the Limited experience
Titled War of the Spark , the major selling point is the large number of powerful planewalker cards, 36 in total, far more than in a normal expansion
It doesn't grant the land any intrinsic abilities
Multicolored cards of exactly two colors now have distinctive looks, lands that produce one or two colors of mana have piping to remind you what color they produce, and Ravnica introduced things like guild watermarks
Since each Shrine is legendary, it's impossible to have multiples of one on the battlefield at once, making them incredibly hard to build around in 60 card competitive formats like M:TG Standard
It all works tightly for the mana package