I'm a MTG Player from way back. I've taken several breaks, but my son and wife have gotten me back into it. I'm very glad they have taken an interest in something I find so much entertainment in.
Thank you for the clarification. They are very cool and I really enjoy using them as life counters. Being able to mix the colors to match whatever deck I am playing is nice. Also excellent work on the link, I bow to your Google-Fu.
I believe these are the dice you are asking about. I have had these for a long time. I think they came in a third or fourth edition fat pack, but I'm not sure. Around the time of the Ice Age expansion I bought a friends Magic stuff and these were in there. I have searched several times on Google and eBay for these, but haven't gotten any results.
http://www.dicecollector.com/THE_DICE_THEME_MAGIC_THE_GATHERING.html