Deadpool, the mouthy mercenary producing big box-office sales, may soon set a record at a comic-book auction.

Cover artwork featuring Deadpool¡¯s first appearance in the comics went on sale this week at Heritage Auctions with an asking price of $7.5 million. If it sells at that price, it will be the most valuable comic-book art ever sold.

The penciled artwork was created by writer/artist Rob Liefeld, at age 23, for New Mutants #98, which was released in February 1991.

Liefeld does not own the artwork. He sold it to a collector 25 years ago, although he said he is thrilled that the character he created is doing so well financially.

¡°I just keep smiling,¡± said Liefeld about the auction.

The original cover art for Rob Liefeld's New Mutants #98, which is expected to sell at an auction, is seen in this handout picture.
The original cover art for Rob Liefeld¡¯s New Mutants #98, which is expected to sell at an auction, is seen in this handout picture. | Rob Liefeld/Handout via REUTERS

Ryan Reynolds plays Deadpool in box-office hit ¡°Deadpool & Wolverine,¡± a movie from Walt Disney-owned Marvel Studios. The film ranks as the highest-grossing R-rated movie of all time with more than $879 million in global ticket sales.

When New Mutants #98 was released in 1991, the comic book cost $1. Now the original editions have become one of the most sought-after comics for collectors, with issues selling from $350 to $55,000 on eBay.

¡°Selling artwork was part of the income stream back then,¡± Liefeld told Reuters. ¡°I sold this 25 years ago. I have zero regrets.¡±

Liefeld created Deadpool as a combination between Spider-Man and G.I. Joe. Immediately after his first appearance, Marvel Comics was flooded with fan mail.

¡°Marvel contacted me and said, this is the most fan mail we¡¯ve had on a new character in 15 years,¡± said Liefeld. ¡°They were flooded with letters, fan letters, which they sent me. And the box that that mail arrived in ... I thought I was getting a washer and dryer,¡± he joked.

The current record holder in comic-book auctions is a copy of Action Comics #1, which features the first appearance of Superman and sold for $6 million earlier in the year, also at Heritage Auctions.