New Redemption Grab Bag now includes an assortment of 500 cards from five (5) different expansion sets. Available at Cactus website.
@Red - The big deal is a rescue where I can get a D9 before throne triggers right now. With a slight modification it’s a D10 before throne triggers.The mulligan would just be for increasing consistency since less draw abuse will be in the game. Not a must, just a potential idea.
Set Rotation does help solve many problems but if any legacy format is to exist which likely will those formats will still have the same problem and there is nothing to say that a similar problem won't occur in the newer format.