Talismans help the deck's mana curve, and Great Furnace doesn't do any natural damage to the deck, but both are artifacts and both are therefore targetable by artifact removal.
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For instance, even though it's my most powerful spell, I often had to hold off on casting my Pluck of Many spell that duplicates my character since it has an extremely high mana cost.
Insulting someone's mana was highly discouraged and usually met with retaliation, so later chiefs would often go to war to reclaim their mana or take revenge on someone who had insulted them.