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
Lets be real, balancing one card is going to be tricky, two almost impossible while still playing the game, three, forget about it
Exhaust , : Loot deals 3 damage to any target
This is because the mill also replaces the draw effect and the player is no longer drawing a card
Cards on top of your library that appear in play due to Yet Another Aether Vortex do not come into play nor trigger any other effect that happens when you play a creature (such as As CARDNAME comes into play and CARDNAME comes into play with)