These are exactly like the regular EX variants, but they have their own unique art and often look drastically better than the regular ones
the most common is Legendary , which prevents players from controlling more than one permanent of that name, and allows them to be used as a "commander" in the popular "Commander" format
However, the million dollar question is: What happens if a land has a non-mana ability that produces mana
While it costs more mana, its less restrictive because you dont need more than a single red mana
(Since you can only apply a replacement effect to a single event once, the nonsense stops there.) In that case, you'd flip a coin
These are all issues from the last few years I could remember off the top of my head, so theres bound to be more that I forgot about