you simply combine two packs to create a ready-to-play 40-card deck
When life totals are redistributed, each player gains or loses the amount of life necessary to equal the other player's life total
Given that no card here pulls us strongly in any one direction, this is a very easy spot to take a land to make sure our mana is good while keeping our mana open
I won't go deep into each one, but they all have some form of cycling which can be a boon if drawn later in the game when you don't need them, or, of course, for cycling strategies (toss in a Fluctuator and burn through your whole deck.) Some produce colorless or single-color mana
Once you have seven unique lands, every new land makes a token
Rares and uncommons typically handle one job well, while Mythics handle several