Board Game Arena

Well, I experienced what would happen in a game anyways, so I guess I'll respond to my own question for anyone else who is curious. If you do play the marketplace, you don't receive any cards and it acts like a watchtower with no face down cards; there is no effect.

Recently, I was playing a two-player game where an interesting scenario might've occurred. I had played a marketplace and could've given my opponent the option of having only the marketplace in their hand. I was the last player, so if they had played it, they would've had no cards in their hand and ...