mtg exile cards from graveyard The 44 Best Hate and in Magic Ranked What happens to exiled cards

Destroying all lands (even just nonbasic ones), while not as common these days as it used to be in the world of Magic, is still a potent effect, and Ruination does the job extremely well

(The inquest article calling necropotence the worst card in Ice Age doesn't help either)

The phrase any target means that you choose a recipient as you cast the spell

Aether Refinery offers a great way to create powerful tokens

There are plenty of other kinds of decks you can build and I cant list all of them, but these archetypes should be enough for you to understand what you can expect from other players and point you in the right direction to get started

I think of choose as being inherent to the effect while targeting can be responded to