Its got a hard-to-achieve activated ability to gain a really limited version of hexproof for one turn
The cEDH approach uses Rograkh as an easily-accessible piece of sac fodder for partner Tevesh Szat, Doom of Fools or a ritual like Culling the Weak
Steel represents powerful characters who can hit hard, defend staunchly, and bring home tons of Lore, while Sapphire represents tactics and careful planning
Its also fantastic against token decks, sweeping up entire boards with no hope of getting them back
While its more likely to end up in the 99 due to its lack of blue, white has seen more and more effects printed to buff its solo blink capabilities, including the recent Teleportation Circle
Colorless decks also maximize the potential of cards like Liberator, Urza's Battlethopter, Forsaken Monument, and Ugin, the Ineffable while breaking parity on All Is Dust