You can't have a Naya deck without Wild Nacatl haha. Mighty Emergence is pretty handy as well because then instead of 5/5's you'll get 7/7's =D A couple of my favorite Naya cards are Meglonath, Cliffrunner Behemoth Spearbreaker Behemoth and Retaliator Griffin. Idk if this helps you at all.
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I like Merfolk, you can do a lot of things with them. I personally hate mill decks, so I discarded that idea while I made my deck. I tried to put a lot of ideas together like tokens and the silvergill douser/merfolk thaumaturgist combo, which btw is really cool haha. After I get a shit ton of tokens out that combo works really well, I can also make all of them unblockable with deepchannel mentor (I'm surprised you don't have that card). http://www.mtgvault.com/ViewDeck.aspx?DeckID=70863 this is my deck if you want to check it out.... comments are appreciated too. oh and I'm not going to say that my deck is the best in the world, it's just another deck that I made.
In my Squirrel Deck I run a Parallel Evolution, Muraganda Petroplyphs, Luminescent Rain, Deranged Hermit, and Overrun. All of these cards are really cool, especially when you get the infinite combo out and use Luminescent Rain then Overrun. It's very fun haha.