Urzas Saga has a cycle of legendary lands, many of which well see later here, and Phyrexian Tower is just the first of many great ones
Sacrificing a creature is not a cheap effect, even in decks where you want to do so
These are usually better in formats like Modern with fetch lands and shock lands, and worse in EDH, because going from 40 to 10 or so isnt safe at all in these formats
Ive written about a variety of commanders, such as an ode to my favorite novel series growing up, Redwall, several Rube Goldberg combo commanders, and even an Unsummon-loving waifu
Arena is about as close to the actual game as it could be, with no particular fiction surrounding it
1 How to Build Your Deck Booklet