Also being able to rewind 2 or more times per turn is much more powerful than 1 time per turn, because 1 only stalls the opponent, but 2 allow to return everything he has already played. Also if you are using one to prevent decking out, you can use the other one on your opponent. This kind of technique + some healing would be able to defeat many decks by itself, and a possibility for such a technique to appear in many rainbows (1 eternity + 1 lucky mutant, so quite probable to happen) would basically add another winning strategy to already powerful rainbows. (Especially because rewinding right now is pretty expensive, at
but a mutant always has an ability cost of 1 or 2 quanta of his element, so in fact mutants with rewind would be easier to use than a number of flying eternities)
