If my demon is targeted by a Remove From Game ability while I have Covenant of Eden and Tartaros in play/set-aside, does my demon go to Tartaros via a "double Instead"?
Covenant of Eden - "Use as an enhancement or an Artifact. No character may be removed from the game. Instead discard the character targeted for removal."
Tartaros - "If your demon is discarded or captured, you may hold it here instead. If your demon wins a battle, you may underdeck a demon from here."