Five chapters. Thirty stages. Every one of them a fight.
The Story is not the endless game with a plot bolted on. A stage boss has hit points, your Season score is damage, and there is no target to clear — everything you grow, you spend. It hits back every Season it survives, and takes a creature off your board when it does.
Each chapter is five minion fights and then the thing they were leading to. The minions are drawn from their boss’s own lore — chapter one is the tide going out, so its five are what the tide left stranded. Beat the boss and you win its card: the tamed half of the thing you just fought, and the one printing in the game that cannot be bought.