It introduces Mega Evolutions, Fairy-types, and Spirit Links to keep evolving without losing a turn
Generally, it's not worth putting a ton of Towns into your deck just to get the minor payoffs
I have never really played the Baldurs Gate videogames, so I cant explain the lore behind it, or how it fits into that universe, but it fits like a foot in a glove in Magic
This allows you to use your own creatures as mana sources with which you may cast the creatures revealed from the top of your library
This is one of the most dangerous cards in the set, and kind of surprising to see actually printed
So now we have three generations of Infernal Spawn of Evil -- each art references the art before it, it's super cute