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What would happen if someone gets rid of Rome while Judas Plot is on a emperor. Can they still use it?
As long as it does not enter battle before the trigger occurs, I don't see why it wouldn't work.
since it was placed, would it be discarded, or simply not work anymore?
Entering battle would do nothing. Placed Enhancements do not re-activate if the card they are placed on enters battle. If Judas' Plot is on an Emperor through Rome or any other reason, it will stay there until the bearer is removed from play or Captured.
Entering battle would do nothing. Placed Enhancements do not re-activate if the card they are placed on enters battle.