Balance Thread

Trader Ship
Seems really expensive to me.  Basically like a souped-up Melrak Channeler, who is himself of questionable utility.  Roughly the stats of a 5-mana creature, mediocre ability.
Suggestion: 333 cost, 444 sac
(EDIT: Fixed!)

G Lens Laser
Crossover's baby brother.  Given that you're spending a card and a slot on it, I think making it simply cost half as much for half the utility isn't necessarily sound.
Suggestion: 111 sac value

Power Cell
While I wince at the thought of spending an effect slot on this, I can't really argue with 1/1/1 and cantrip for cheap power.

Ultracell Battery
This probably isn't a bad play for the big Power-hungry super-cards.  Go nuts with the Zeus like it's 2099, and by the time the Ultracell dies, the Zeus (or your opponent) probably has, too.  Less useful for things like the Clockworks and the 1-power stuff.  Probably a decent tradeoff with the Power Cell.

Hydrogen Cell
While that's a useful effect to have around, I think it could stand to be slightly cheaper.
Suggestion: 444
(EDIT: Fixed!)

Shell Game
Now that's a fun card, and very versatile.  Too bad it's so expensive.  7/7/7 is really an incredible amount of mana, especially since I think there should be less of a 'discount' for multi-color spell costs, because I'd argue that there's less benefit in 'rushing out' a spell than a large creature.
Suggestion: 555
(EDIT: Improved)

Symbiote
Haven't had the chance to play it or see it played yet, so for obvious reasons, I can't feel very comfortable trying to make any intelligent comments on its balance.  <strike>That said, looking at the various "Symbiotic ______" cards using getcard, the possibility of using Symbiote on a Dragon Whelp to get a 99/99 ability creature makes me shudder.</strike> 30% damage on Symbiotic Golems does seem a little over the top compared to the other abilities.