To be fair, I also had a misunderstanding at the time about how Yennetts attack trigger worked and thought uncast spells stayed on top of the library
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All in all, the decks each have something of value to them
In Modern, where most decks use Fetch Lands to fulfill their mana requirements, Wrenn and Six is incredible in securing your land drops and giving you access to all the colors you need
You can combo off by targeting the dragon with your own spells, too
Overall Sultai Arisen brings a new marquee commander option in Teval, Balanced Scale, and provides a lot of useful cards for graveyard based decks in Sultai colors