Cards that allow you to play extra lands, such as Exploration, Burgeoning, and Azusa, Lost but Seeking, provide tremendous amounts of ramp
Instead of seeing your mana as an investment into a card, its now more of a gamble
Its basically a double Conjurer's Closet on its own, but it also lets you trigger any beginning of end step effects you have a second time each turn
For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Zack Fair's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature.
The decks definitely have a sense of flavor over function even though theyre functionally well crafted, their flavor shines a lot since theyre set-themed