He started with a commercial deck based on Burgess's creations, which I gather was equivalent to Old Maid, and added cards sufficient to make up two teams, by both cutting out Burgess characters from books or magazines, and drawing the rest.
The homemade cards were backed with cardboard -- sometimes from cereal boxes or other sources. One is a movie flier of some sort; the blurb for the 1933 Western, "Smoke Lightning," IMdB says "Branded as a killer--hunted, hounded, driven to desperation, he turned on his hunters and shot his way to freedom--and the heart of the only girl." The plot for "Grand slam" is too complicated to go into here!
The numbered cards (from another deck) determine the baseball play. At the bottom of the following stats sheet (he kept meticulous records for every game he played) is the valuable key to scoring runs.
1=Single; 2=Out; 3=Strike Out; 4=Out; 5=Double; 6=Out; 7=Double Play!!; 7=Out; 8=Second Base; 9=Out; 10=Triple; 11=Out; 12=Out; 13=Walk; 14=Walk; 15=Home Run
He would call out the plays as they occurred, as though he were a radio sports reporter. In fact, before deciding to go into English, he wanted to be a sports announcer or reporter. (A future Sepia Saturday will feature excerpts fom his long-running hand-produced "Daily Blah" newspaper, which he singlehandedly issued throughout high school).
He also made some of the cards from photos, including two of his dogs...Mike was supposedly an Airedale, and I have never seen any other photos of him, but this does not look anything like an Airedale to me! Some card illustrations were from other sources. Reynard the Fox was marked as team manager.
Here is the stats chart for the Animal Baseball team.
Buster Bear and Grandfather Frog were apparently hall-of-famers who got special plaques.