I wouldn't be too quick to judge. I think this card might not fit in most decks, but I think the fact that it's a murloc makes it runnable in aggro. You usually won't get anything, but from my calculations you'll likely pick all 3 correctly around 33% of the time as long as you have good knowledge of the meta and are paying attention to what cards your opponent is playing. Trump came up with 50%, but I think that's a little on the optimistic side.
If you get the cards, that's a huge swing in card advantage that can easily win you the game, especially in decks without very much draw. Without them, he's still a 3/4 murloc which is definitely playable in those decks.
4
Wow, Millhouse was already an insanely bad Mage legend, but this card straight up insults you. Rare at best, absolutely no legandary.