Once upon a time, there was a story book that gave great rewards to Commander players…
Shuffle the 10 story cards in a face-down pile on top of “The End,” in the storybook.
Flip over the first card when the first commander is cast.
On your turn: If a commander has been cast this game, you may flip over the next story card as a sorcery. Your first flip each turn is free. Subsequent flips cost 1.
The last revealed story card applies to all players.