The faster you chew up the mana dorks for extra cards and lands, the quicker you get to your giant threats
Having a more simplistic way to bring in people, I see this as Wizards trying to revitalise Standard
You can also always choose fewer than four copies of the card to exile, even if there are more in the deck
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Prosper, from the accompanying Commander decks, is an interesting case, because it is the first time they tried to find synergies for the mechanic
Rad counters are put onto players, and trigger at the beginning of the first main phase of the active players turn (the one before combat)