It's basically clone of Cycling from MTG. You'll play it if the actual card will be good or if there will be good cards that trigger when you trade.
Think about it - You have a card that you don't need in particular part of the game. Instead of holding it in your hand or burning it to do something unnecessary you'll be able to trade it for draw. One mana for an option to trade not needed card in your hand for something potentially very important like removal to save yourself from threats or burn/pump spell to finish the game is pretty huge.
Tradeable cards for sure will find place in meta decks as this kind of cards with option to dig further into your deck. And again, if we get some good cards interacting with trades it may even end as meta deck on its own.