If I play an action as part of resolving Prophetic Vision, will my opponent lose 1 lore while I gain 1 lore?
No. The lore gain and loss only occur if you don’t choose to play a revealed action card. If the revealed card isn’t an action card or you reveal an action card and choose not to play it, that’s when the lore gain and loss occur. Look What You’ve Done Look What You've Done
Official set release notes — Attack of the Vine!