Council of Elrond

Cast From the Order

Playable on a Fallen-wizard. Make a roll and add the Fallen-wizard’s stage points. If the result is less than 16, discard this card. Otherwise, place this card with the Fallen-wizard. The Fallen-wizard’s player must use minion sites for Border-holds [ ], Free-holds [ ], and hero Havens [ ]. Also, the Fallen-wizard’s company is overt.

Do sites that are currently in play change immediately? (which seems very awkward, but seems to be inferred from other rulings, but I haven't found it stated directly)
Or does this effect just apply to any new sites played?

White Hand, Getting Ready to Play, Movement wrote:The play of certain cards can change the type of sites that your companies may use
(e.g., Plotting Ruin, Heart Grown Cold, etc.). When this happens, immediately
exchange any affected site cards already in play with the corresponding site cards of
the proper type.

Underline mine.

Thanks, missed that one

Nice little card to make your opponent overt... so you can go and beat the crap out of him!!