Prosper, Tome-Bound requires considerably more setup to use optimally, but if your deck is already playing a lot of cards that let you play cards from exile, the value it generates from its Treasure tokens can be absolutely silly
There arent enough aggressively costed red removal spells worth playing
Zellix shares almost all the same lines of synergy as Nghathrod when played as commander, so if you feel like more early combat pressure is preferable to fun steal their card triggers, you can try it out without need for any other changes
The Wandering Emperor The Wandering Emperor is the first planeswalker with flash, and as such it's a threat that control players dont have to tap out to cast
Well also be picking cards based on their broad playability, so cards like Mirrorform, which are unlikely to see use outside of Commander, wont earn slots here
While not repeatable in the same way Time Vault is, Time Walk doesnt require other cards or hoops to jump through to cast