Mutate+otyugh > dragons. Furthermore, if you roll a critter with mutate in one of your own mutations, that also = GG to him. Frankly though, I never save my sundials. I just use them as card draw, and if they hold back something, that's just gravy. After all, six sundials stall for 12 turns, and considering that you draw one card normally and one with hasten for twelve turns, that's 7 in your opening hand, and another 24 through the time under sundials, and if you have an electrum hourglass, if you're running a 40-43 card rainbow, you should more or less be able to come near decking out if you just keep chaining the dials.