You see, whenever Frodo, Determined Hero enters the battlefield OR attacks you can attach target Equipment that you control with a mana value of 2 or 3 to Frodo himself, which can give Frodo more abilities and more power
That means you always have access to it in the command zone
This lets their unified strategy really come to the forefront, as support and buff cards can be applied across the board to any other cards in play
A transforming commander card, Kujas objective is to fill the board with his black wizard minions and other cards that will boost damage from playing non-creature spells
That up-front Adventure is just a bonus -- the real reward is outlasting the opponent with reanimation that draws from either graveyard, which is even better in "aristocrats" builds.
Dont forget the many excellent nontoken Spiders too, like Nyx Weaver, Rotwidow Pack, or even Unfinitys Spinnerette, Arachnobat to buff up your brood