If Sauron, the Necromancer leaves the battlefield before the delayed triggered ability resolves, that ability will exile the token, even if Sauron, the Necromancer later returns to the battlefield or you control another copy of Sauron, the Necromancer as your Ring-bearer.
This means (a) there has to be enough creatures with the creature type to matter mechanically (although having a lot in the past also helps) and (b) it has to flavorfully fit
While most major browsers support the feature set Ill be discussing here, Im going to reference how I did this using Chrome for clarity
Adventure Adventure (CTRL to add secondary) Bounce Bounce (CTRL to add secondary) Burn Burn (CTRL to add secondary) Copy Nalfeshnee Flying Whenever you cast a spell from exile, copy it
See how in the proxy even the border is wrong it is not totally black.
This artifact creature can see play in many different EDH decks, and theres a few synergies with pingers like Ob Nixilis, Captive Kingpin, even in Standard