> (anytime a burrowed creature attacks digging goggles is assumed to
> be out)
> 1. If I attack with a burrowed creature that has seven energy, and
> target one of my opponents creatures with 5 energy, does my
> creature lose two and his is destroyed?

Yes, that is correct.

> 2. If my opponent attacks that same creature on the next turn,
> which now has 5 energy, with a 5 energy creature, does mine only
> lose 2 and his is destroyed?

Yes, that is correct.

> 3. Does burrow only allow a maximum of 2 damage from each source on
> a given turn, or 2 total damage to the creature on that turn (ie
> attacking the burrowed creature and then attempting to lightning)?

Burrow allows a max of 2 energy loss total per turn, from Spells,
Powers, and Attacks. Note that energy loss from Effects is not
prevented by Burrow, and that burrow does not prevent direct removal
(from cards such as Shockwave or Alaban, for instance).

-Rich Riley
Redeemer of Ogar
Magi Nation DUEL Rules Team