Savio Corvi reads:
While there is at least 1 Conspiracy card in play, Savio Corvi gains "Night. It is Night. Destroy all Day cads. Savio Corvi is immune to non-Day card effects.
There doesn't seem to be any timing or trigger for the "Destroy all Day cards" part of the ability to kick in. Usually Day or Night cards say something like "After xxx comes into play, destroy..."
Any thoughts on when this would happen, or how to resolve the logic via the FAQ or rules?