Heart of the Anomaly was distributed exclusively to attendees at Linucon 2004 in Austin, TX.
From Steve Jackson the designer and founder/owner of the publishing company:
| "Heart of the Anomaly" is a Star Munchkin card created by an Austin convention, with our gleeful approval, to honor their GoH, Wil Wheaton . . . and if you get your hands on one, it's legal. This is the one and only English-language card that was not produced by SJ Games yet is legal in play. It is a genuine rarity. (ref: link)
On November 24th, 2011, a Heart of the Anomaly card sold on eBay for $1,031.78.
The current position of Steve Jackson Games is that they will never reprint this card.
This card is up for sale again in 2015: http://www.ebay.com/itm/Heart-of-the-Anomaly-Munchkin-Card-signed-by-Whil-Wheaton-Steve-Jackson-/271775582511?