There are duplicates of many of the cards, and while I don't have instructions, I would guess that the cards are shuffled and then drawn to decide plays. The line drawings are color-coded, so it's possible that different colors were in different stacks based on move choices by the player.
Yellow cards are batting-oriented, pink are pitchers. Green are baserunning plays while blue are fielding. If I were playing, I'd shuffle the yellow and pink together, and blue and green together, and choose a yellow-pink card to determine most plays.
This card is labeled "Steal Out".
These are Double Play."Touch Out" (tag-out). Fielding cards are all outs.
Batter Out.
Strike. There are a lot of these. I guess this gives chances for strikeouts and stolen bases. Speaking of which...
Double Steal.
Steal.
Bunt. I guess these are successful.
Home run.
"Three-base hit" (triple).
"Two-base hit" (double).
"Single hit" (single).
Dead ball. There's one of these, I guess it's a random no-play card. Does it count as a balk? Catcher's interference?
Wild pitch. Great when runners are on base!
Ball. Again, lots of chances for steals and walks.
There's one green game card and a blank card for replacing missing cards. Or making up your own play? I wonder if this set came with little game pieces to track balls, strikes, outs, and baserunners. Plus, you'd need a sheet of paper or something to keep track of runs.
It's a basic game, but it could be fun for younger kids who can't handle more-complicated trading card games.