Well, I think taking it on Warrior difficulty is a bit too much. It works great on Veteran, though. And the fact that the stone is deadly is situational. On Hero difficulty, you might not even be able to build a market to trade for it... there are always limited resources.
I wasn't suggesting playing on Warrior difficulty. Veteran is the sweet spot. And against the AI, Hero difficulty is too easy.
Творят настолько черные дела,
Что до таких блистательных идей
Не вдруг дойдет и записной Злодей
Темный адепт клана GODS