­Dream Eater

Perhaps "Turn... face down, , : Add ." so you're also required to have mana up for the superfast exile hosing ability to be 'online' as well as make it more of a colorless fixer.

I really dislike costs where both players use the same pool of resources - especially at common. This can be paid by turning cards any player owns face down, so you can use your mana ability to deny your opponent their mana ability.

Imagine how much worse Processors would interact in a mirror if you could bury exiled cards from either player rather than just those owned by opponents. Alternatively imagine the consequences if delve could use opponents' graveyards in addition to your own.

Being more of a public zone (ie. more shared) is what I was thinking the role of exile would be in comparison to zones such as the graveyard.

The processor mirror would certainly be strange, not sure if it would be 'much worse' per se. Maybe you could expand on that point?

I don't think delve is exactly comparable since it's for graveyard where there are so very much interaction with that zone where as exile is much more static.