You keep the Material supply on here. (You add it to Tycoon but can't spend it.)
After scoring, Rivals discard all Material. Prelude: You may discard this to steal 1 Material.
Keys: 2
A: The resources count towards ambitions and Keeper's Solidarity, but they cannot be discarded for Relic Fence or be stolen.
A: Yes.
A: Yes. Any card that says you can discard it to do something else can simply be discarded.