There is a new twist to rookie baseball cards:

Major League Baseball announced before Thursday’s openers that players making their first appearances will wear debut patches on their jerseys. The patch will appear on different places of a sleeve, depending on the team and any anniversary of sponsor patches.

After a player appears in his first game, the patch will be authenticated and placed on a Topps baseball card as part of an agreement reached by MLB and the business wing of the players’ association with Fanatics Collectibles, a division of Fanatics that acquired the trading card company Topps last year.

Chron.com

One patch, one card. What the story doesn’t say if they goes out in a random pack of cards. Here is more from the press release:

When a rookie is called up to the Majors for the first time, the Debut Patch will be placed on their jersey. Following the game in which he sees action for the first time, the patch will be removed, secured and authenticated under the auspices of the MLB Authentication Program for inclusion in an upcoming Topps product.

prnewswire.com

So right now it’s an Underpants Gnomes business plan.