
The real question here is if Sled Dogs are viable if you have not 4 but 6! Not only does this combo increase the maximum potential of the good boys and girls, but also helps you find them earlier, as a quasi-tutor.
On that note, this card allows playing cards that you already have the maximum number of copies in your deck, because they are not added to it. Looking at Open Gate or Fortuitous Discovery, for example.
Enjoy and go crazy ;)
EDIT: Having a third copy of Ritual Candles almost makes curses into blessings.