Cool Card Design of the Day7/7/2016 - Yesterday's Deluxe aims to help players stuck with cards in hand, but flies dangerously close to Saviors of Kamigawa's "don't play your cards" mechanic. It's also hard to develop and reads poorly. It might play quite well, but even if it does, we can surely find something that accomplishes similar goals without all those drawbacks.
Let's attack the problem from another angle.