Demon Knights artist Bernard Chang is so excited about the release of Issue 16 on Wednesday that he's going to give away all 20 pages of original art to fans who buy the DC Comics series.

Breaking down the process this morning on Twitter, Chang explained his plan: He wants readers to buy six copies of Demon Knights #16, keeping one for themselves and the rest to their friends who aren't following the series (or ask your retailer to distribute them in pull boxes). But first, take one photo of yourself holding all six copies (like so) and another with a close-up of the receipt and the name of the store. Then tweet or email those photos to Chang, who will call the store to verify the purchase.

The first 20 people to do so will receive a page of original art signed by Chang. Those six comics will run you in the neighborhood of $18 (not accounting for sales tax or discounts); a page of original art by Bernard Chang sells for anywhere from $45 to $175, so you'll be coming out well ahead of the game. The giveaway begins Wednesday at 9 a.m. PT.