And, at least from my reading of the explanation, it has the capacity to offer a much more varied suite of decks for players to try their hand at offering "dozens of games straight from the box." In a nutshell, WOTC wants to give new players an onramp to MTG from the "I am interested in Magic, but I dont know anything." stage all the way to the "Oh, Ive identified what I like to do, and Im going to do more of that." stage
Also, digging you deep for the pay off, if you dont already have it
The Yennett deck is extremely salty
Bring him out early and start moving Deserts into your graveyard to grow an army of Plant Warriors
All the enchantments can go
(A player with ten or more poison counters loses the game.) Whenever another creature you control with deathtouch dies, each opponent sacrifices a nontoken creature of their choice