This past weekend, I played UW Fish at the Sports Zone in Cary, NC. During a match against Grim Long, the following play situation arose in game 3.
He had:
In play: some lands, artifacts including mana crypt and jar, necro, and swarm.
In hand: 7 cards, one of which he had I. Sealed for.
In yard: some acceleration, and seal
9 life
I had:
In play: mage on Will, stormscape apprentice, plains, and tundra
In hand: magex2, daze, beb
20 life

what is the correct play on my turn? As I see it, I have two options.
1. Beat with mage, on his turn tap down the swarm in order for draw sevens to be useful for me too.
2. Beat with both, and play mage #2.

If you choose #2, what do you name with the mage? For background, I have 4xforce, 2xdaze, 3x chant still in the deck, and game 2 he played a massacre.

I ended up choosing to play mage #2 on massacre figuring that for his Isealed card(also because I got burned not playing a mage on pyroclasm against Machinus earlier), and lost to several draw 7's, CoV on the Will mage, and desire. I drew an active force in a jar hand, which may have won me the game (I also found out afterwards that he had sided out massacres :/, so a mage on tendrils or Will would have certainly won it)

Thanks for the report! It's always nice to see innovation with cards from the most recent sets.
After playing the same configuration of grunts and ninja's in UW Fish, I agree with your concern. The fourth grunt should often be sided out, and is only really important in the aggro/fish matchup, therefore relegating it to the board seems to be the right call. The ninjas are also very sub-par when you want to keep most of your creatures in play. The next-turn-dying-grunt/ninja synergy looks decent at first, but it rarely works out. The one caveat I see concerning their removal for tops would be that you would then be down to 18 blue cards including 6 pitch spells. The addition of tops would also suggest testing counterbalance, however UU seems difficult.
As for similar decks, the closest I have seen is a h/s control deck from NC called Cullen Duece. A list is here:http://www.themanadrain.com/index.php?topic=29821.0. It uses more of a toolbox approach, and has done well at small tourney's in the south east.

Congrats on your finish, you'll get that win one of these days.

Edit: I just looked it up and you cannot stifle meddling mage's cip ability because of the wording "...as this comes into play..." rather than "...when this comes into play..." - something to remember.

Thanks to everyone that came out to sling some magical spells and make for a fun tourney. I figured I should get a tmd account to make it easy to keep in touch after I go back to RIT. If you guys ever want to hit up upstate NY, let me know.
Later, Jeremy