Quick test on exploration mode suggests you'll probably get 3, but 2 or 4 are possible. If you get 4, then it's 12 points of Wi with morgia help, which is pretty substantial, though even then you won't see huge benefits from it without the water orb or another Wi-boosting item.
If your learning is decent enough, spellbooks of acid ball or something might be worth considering. I've been really taken with regenerating items recently for wishes, though you're late enough in the game that it probably isn't a huge priority anymore.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.