Wow, this idea is similar to my The Mime deck... I would recommend that you take a look at my version for ideas. It is a very fun deck to play... And I disagree with Darcado, with a deck like this as long as you have the copy artifacts, twincast/mirror sheen, and copy enchantments. Your way of winning is the same as your opponents. It makes the whole game very interesting.
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What about Daru Warchiefs?
Sanguine Bonds and Tainted Sigils would be very nice in this deck
I would take out at least 2 Tolsimirs and add 2 Msaters of the Wild Hunt and make sure you add some Wyluli wolf's
I might switch out Arcane Sanctum for either a Drowned Catacomb or a Watery Grave
24 lands total might be overkill for this deck, especially since you are using the lower cost zombies
I would probably exchange Essence Warden for Wellwishers
Hey I am attempting a Hydra deck as well. We actually had a lot of the same ideas. You are welcomed to check mine out to get some ideas. However, mind still needs a little work
Protean Hydra will be switched for Titania's Boon once MTGVault.com puts Magic2010 into the mix
Raven Guild Master is a nice card, but by they time you can get him unblockable you will be one turn away from being able to put a Nemesis of Reason into play. Which is a lot more threatening and harder to get rid of.
Cidlocke
This deck could be very fast, a few more Elvish Pipers might be nice though. All in all it is an interesting deck.
*create creatures*
Dralnu to replay cards like Glimpse and Psych Drain Lich Lord is to creature creatures to defend against creature decks