Steam Trading Cards are now available for OOTP15! Collectible cards about baseball - we're pretty sure no one ever had that idea before! There are 8 cards, 6 badges, 5 backgrounds and 5 emoticons to collect. Cards will drop every half-hour of playing time.

See Valve's Steam's card site if you're new to Steam Trading Cards and would like a little more information, and the OOTP15 page on the Steamcardexchange.net website if you'd like to see how much your collectibles are currently selling for.