Rather than playing the Speedway for free when you play Jim, you want to put the Speedway into play after Jim is on the board and at a location
And when she dies, she passes that strength on, putting X +1/+1 counters on each legendary creature you control, where X is the number of counters she had
Then put a +1/+1 counter on each creature you control
Jim Hawkins and the RLS Legacy crew from Treasure Planet further ramp the science fiction adventure vibes
The true adventure, however, seems to be in finding cards to play.
As a trade-off, she requires another of the player's characters to be returned to their hand to avoid immediate self-banishment, but it's a price that's well-worth playing