Each deck is designed to fit perfectly thematically with the Kamigawa: Neon Dynasty set
The planeswalker types are Ajani, Aminatou, Angrath, Arlinn, Ashiok, Bolas, Chandra, Dack, Daretti, Davriel, Domri, Dovin, Elspeth, Estrid, Freyalise, Garruk, Gideon, Huatli, Jace, Jaya, Karn, Kasmina, Kaya, Kiora, Koth, Liliana, Nahiri, Narset, Nissa, Nixilis, Ral, Rowan, Saheeli, Samut, Sarkhan, Serra, Sorin, Tamiyo, Teferi, Teyo, Tezzeret, Tibalt, Ugin, Venser, Vivien, Vraska, Will, Windgrace, Wrenn, Xenagos, Yanggu, and Yanling
In this context, Time Vault is simply a better Chronatog, which was a common card in later Stasis decks
As such, if you want hexproof cards, buy blue and green theme boosters
Many decks splashed white just to run Disenchant, such as early Sligh decks which otherwise couldn't remove a Circle of Protection: Red (and yes, we're talking pre-Anarchy here)