Sacrificing lands can be used to a deck's benefit, whether its to trigger a specific effect or to increase the number of them in a graveyard, and cards like Elvish Reclaimer fit naturally into a strategy of abusing land effects
However, assuming that you're building a fairly typical deck, there is a really simple way of figuring out about how many lands you should put in your deck
This is thanks to Wizards rarely reprinting chase variants of cards, especially with the same foiling technique
Some powerful item combinations make their way into the game, as do some great action cards such as Light the Fuse
I want a giant print across my wall to study
How many keyword soup creatures can you put in your deck, and how might you put some of them in the graveyard to pump all your other creatures