Beyond protection, Spider-Byte, Web Warden can bounce troublesome permanents, which slows down an opponents progress, and Spider-Man 2099, Miguel O'Hara lets you keep the cards flowing while it rewards aggressive combat steps
Yidris is my favorite of the four because its not only powerful but gives you access to more cascade cards than other options
At first, its just a land that taps for blue, but once you station enough charge counters onto it (12 or more), it transforms into a serious mana engine
Board wipes, targeted exile, and conditional removal help white decks recover even when the board gets out of hand
In particular, abilities that let a player cast a spell without paying mana were often abused, as was the case with Aetherworks Marvel
He looks like he's just there to protect your other cards from harm, surely a rank-and-file member of the 99 rather than a card for the command zone