Like most Magic: The Gathering cards, the value of Lord of Extinction depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Amonkhet Invocations)
One important thing to note this combo does not work with most other fetchlands, because they have to tap for their ability to fetch a land, while this cycle does not
Still, the sheer advantage Nekusar, the Mindrazer can generate alone and the high number of Prosperity-style draw effects mean this deck isnt helpless
I don't get why it's got deathtouch on a 6/6, like Grave Titan a bit overdone
These decks are traditionally called enchantress decks after Verduran Enchantress and subsequent cards in its vein, and that's become more generalized MTG slang for the effect of drawing a card upon playing an enchantment
At its best, sticking an Atraxa just about ends the game