Jubilee Progressive
The Jubilee progressive is based on the concept that every 7 years, in times gone by, slaves were freed, debts forgiven and property restored. That final point is the concept the Jubilee Revisited Progressive League (JRPL) is based. League owners have the player rights to their chosen franchise returned to them every seven seasons. During the six seasons between, via rookie draft and trades, owners try to improve their franchise beyond what their MLB counterparts were able to field and best that MLB Won/Loss Percentage. That is a personally satisfying (or discouraging) unique challenge to the league. The other challenge is much more traditional....make the playoffs, win the World Series.
We only need an owner for Houston to fill out our league. We're starting 1981, so you would have the real-life roster for Houston, which is listed below. For the next 6 seasons, you would get to draft, trade, and otherwise improve upon that roster, much like in most other progressives. The draft order is based upon your franchise's real-life finish instead of how your team performs in the progressive league, so there is no benefit in tanking.
Let me know if you’re interested, and please ask questions if something isn’t clear!