I love themes. Themes for this. Themes for that. Themes for anything. Every deck I build is to a theme as I get so much enjoyment from the visuals and feel you get (I'm a very atmospheric player) so mono-theme decks are a favourite of mine. I'm taking a Cthulhu mono to the Australian Championships on June 3rd so i'll let you know how I go with it and post the list after that. It's a lot different to yours though. I also like multi faction theme decks too, like my 'Welcome to the Clover Club' deck, Syndicate/Agency deck. There's a whole lot going down in there but I'm getting off topic now.

OH. And if you're thinking mono decks (and excuse me but I'm new to the game and haven't even played yet so may not have it right) the Cthulhu would definately be the choice. For one. Simple. Reason.

"COMMUNAL SHOWERS"

This can really mess with mixed decks. Check it out.

(Funnily enough I couldn't fit it into mine......... So many cards. So few to play with)

"My favorite being the synergy between hydra and the temple of r'lyeh. Its sick when you are killing a deep one rising to make your opponent sacrifice a character and then you pay 2 to bring him back and destory another one of your opponents characters."

I believe you are playing incorrectly. The effect for Deep One Rising occurs "[a]fter you play" the card, not on every occassion when the card is put into play.  Hydra allows you to "put it into play", but not to play.  See FAQs, for the distinction between "play" and "put into play".

Dark Initiate said:

He's playing this combo correctly.  COCLCG is referring to the card "Temple of R'lyeh" which is found in the Never Night AP from Ancient Relics.  Temple of R'lyeh is a 2-cost location that reads:

ACTION:  Sacrifice a Cthulhu character to choose an opponent.  That opponent must sacrifice a character he controls.

So you sacrifice a Deep One and then bring them back for 2 with Hydra's ability, and then sacrifice them again.

Otherwise, you are correct that Deep One Rising's ability can't be paired with Hydra to destroy a character.

"you are correct that Deep One Rising's ability can't be paired with Hydra to destroy a character."

That's all that I meant. :)