I would say having them disabled or enabled with weakened effects (e.g. cards like Gioia and Aquila sound incredibly strong in comparison to prerenewal cards).
There is the usual trade-off in completely disabling these cards in that people with the MVP cards won't feel rewarded for having them in PvP settings. However, considering the current climate of the server (no PvP and no MVP cards enabled in WoE), I don't think that would be much of an issue on this server.
Maybe it'd be good to have GMs ask server members about this since it would get more traction on something that is a big factor in pvp and woe.