I've always been fond of Birthing Pod; I've played it in Standard, I play it in Modern, and I'm working to build a list utilizing it that will be competitive in Legacy, although I'm not confident that that will end up as a Tier 1 deck.
I'm fond of the Pod because I've always had a fascination with utility creatures and toolbox-style decks, and I do like playing more creature-oriented lists that can gain incremental advantage over an opponent. I do have a particular fondness of using Birthing Pod to turn Geralf's Messenger into Phyrexian Metamorph, copying Geralf's Messenger and causing massive life-loss between such interactions and Blood Artist triggers. One of the many versatile applications that the 3-and-a-half (if you will) mana build-around-me card can perform.
Ground Seal stops Snapcaster's ability from targeting an instant or sorcery in the grave (for example), but it won't stop you from casting a spell from the grave should you have the ability to do so (say from Yawg's Will).
The fact that the damage will be prevented by Fog Bank's ability does not change how the trample will work.
I would take this point one step further. The government is at least in theory beholden to the people. Sure, a lot of people are sheep and can be bent with the right words and talking points, but at least on the surface, the government has to be mindful of what the people want, and if that includes change, there has to be at least superficial "reforms".
Corporations don't have even this much going for them. They are legally beholden to maximize profit at all expense or risk shareholder lawsuits. Without a well managed government to keep them in check, I see the corporations becoming the state (if they aren't already). I guess at least corporations are honest in stating that they're only out for themselves.
If you use the ability on your turn, your creatures that have the specified creature type will have to attack. If you use it on an opponent's turn, his/her creatures do, unless they are unable (due to summoning sickness, being tapped, having defender, etc.).
However, ultimately, it's a question of speculation at this point, and I feel that the price decline will be lower than expected. Just my $0.02, but I would not bank on getting $10 shocks for awhile.