Huh, where'd this card come from? Didn't see it posted yesterday before the Rhyperior Lv X...
Anyways, Underground Expedition is a fun oldie reprint (think old WotC set) that is still fun to use. Getting to look at your bottom 4 cards, then choosing 2 to nab is always useful, and can combo well with a few cards like Claydol and such. However, there are a variety of better draw options nowdays, which limits Underground Expedition's overall usefulness.
Modified - 6/10 (Still useful for some decks, not for many though)
Limited - 10/10 (Any draw here is good, and doesn't it always seem like the best cards are stuck at the bottom of the deck? :lol
Unlimited - 1/10 (Been here for a while, haven't seen it used)