The cycle of Wishes are a novelty that you won't see too often. The offical ruling is that in tournament play you can grab anything that has been removed from the game or your sideboard. Casual players can also grab a card from their collection. 

I think Living Wish will prove to be the most dramatic, allowing the Green player to fetch a Spellbane Centaur for matchups against Blue, a Nantuko Blightcutter for Black etc. 

Golden Wish is too expensive. 3WW for an enchantment or artifact is ridiculous, considering that artifacts are currently pants, and enchantments work best in combos, so you'd play them maindeck anyway. 

Death Wish is also poor - half of your life is too great a price to pay for diversity, so it's for emergencies only.

Burning Wish is OK, it allows you to get the finishing card that will work best for your current setup. 1R is a good cost too. 

Finally, Cunning Wish is probably the 2nd best. It's an instant, and Blue is the best at reacting to situations, so you can fetch a response easily to the current threat.

Cunning Wish

Constructed Rating *****

My favorite wish, and in my opinion better than Mystical Tudor.  Cunning Wish puts the card directly into your hand so you get to use it immediately while Mystical puts it on top of your library.  The extra two colorless mana is worth it to me.

Of course "tudors" can only search for cards in your library, while "wishes" allow you to search thru your Sideboard.  BIG difference, as this allows you to game one play cards that you would hate to have in your maindeck (like Hibernation) because Hibernation is a dead draw versus a non-green opponent.  

Living Wish

Constructed Rating *****

Another 5 star wish IMO, Living Wish is actually cheaper to cast than Cunning!  Being able to wish up a turn 3 "silver bullet" creature that will crush whatever opponent your facing is a good thing indeed.  The option to search for land is just as useful protecting from land screw early not to mention going for any groovy non-basic you may have a need for.

Burning Wish

Constructed ****

Judgement has several additions to the already long list of useful Sorceries.  Several of the "punisher" cards are sorceries that give you a win/win situation almost every time.  Earthquake, Shower of Coals, Firebolt, Ghitu Fire all are proven to be efficient, having access to the one that is best in any given moment kicks boo-tay.  Use Recoup/Anarchist to recurse these "silver bullets" if you really want to be evil.  

(The above 3 Wishes have the added benefit of being undercosted and easy to splash into most any deck.  Playing with these wishes in a multi-color deck increases the usefulness of the wishes as you have access to more selections to wish for.)

Golden Wish

Constructed Rating ***

The casting cost is what hurts Golden Wish.  WW in the cost makes it tough to cast... and the total cost of 3WW means it'll have a tough time being effective in constructed play. The general rule is that a 5cc spell should win you the game... Golden Wish may find you your way to win but you won't be able to use 'till next turn!

It DOES have the ability to search for either enchantments OR artifacts... although the lack of good artifacts from R&D lately means this is gonna search for Enchantments nearly 90% of the time.  Having said that, there are plenty of good enchantments out there to wish for.  Having "main deck" COP: Red is a white mages dream come true.

Death Wish

Constructed Rating **