Completion lists · Land cycles
Fetch lands
Pay 1 life and sacrifice it to put a land with either of two basic land types onto the battlefield. Usually fetches a shock land or an original dual. Also thins the deck and fills the graveyard.
Track which ones you own in Mana Dork: it marks every card on the list you have, and there's an achievement for owning all 10.
Mana Dork