What is this Karma thingy

[eggman]

Hello, I tried to do a search and I could not find the answer. I am sure it is written here but being knew I am not yet sure how to navigate around. What is the deal with this Karma +0/-0 thingy. What does this signify, who decides it. Seems a little weird but their must be some sense I am missing to it.

[Curt]

Here ya go.

http://aethercards.com/discourse/index.php?topic=298.0