It's a tad inconvenient, but presumably you're going to play it because there's a card in your hand that you don't need/want and you think you can get something better from drawing another one anyways. Scorpion seems pretty keen so far about having cards in hand, so while hopefully they are going to have a great conflict deck, I can see them also being the most likely to have "expendable" cards where abilities like this can come in handy.
On a side note, if Scorpion DOES like having cards in hand, I think that pushes the value of Dragon's province up a bit...could really hurt a Scorpion player who filled their hand with a bunch of cards, only to find themselves discarding back down to four.