I hosted this league about 6 months ago with a $120M cap... this time we'll go with $110M.
There have been well over 900 players in MLB history who have appeared in just one game... think Moonlight Graham. Baseballreference.com has that list of players with the years and dates of those games in their "Frivolities" section under Cups of Coffee. I've played in various Coffee leagues here over the years and they're always fun to research. This one will play out thusly:
We'll be using players who appeared in just one game from 1885-2012. Select a player from the "Coffee" list and note the year, date & team of his one appearance. Then go to that team's page (by year) and click on "Schedules & Results" to find out which team he appeared against on that date. You can use both rosters for that year to make your team. Use any player that appears on either roster according to bbr.com, twisted to any season. You can draft one $200-225K guy from any team for that year... he will be sent down to AAA.
There will be 6/2 below average AAA and depending on whether your Cup of Coffee guy was a pitcher or hitter, each team will call up one (and only one) AAA player and rename them to your Coffee guy's actual name. Your Cup of Coffee AAA callup must remain on the big league roster all season and have at least 25IP or 50AB during the regular season for your team to qualify for the playoffs.
In doing research for this league, I found instances where 2 or more players had one appearance for the same team on the same date. I'd like each team to be somewhat unique, so there will be no "identical" teams allowed.
When signing up, list your Coffee player's appearance date, year, team played for and team played against. I will wait until 5 signups before I make my selection.
$110M salary cap
AAA - 6/2 below avg but only one may be called up
No WW, DH, clones, trades or live play
Injuries turned off
Use the stadium your Cup of Coffee guy played in