King Casimir only lived to be 60. Did he ever go bald? The wikipedia article doesn't say. If so though that would be in line with the 4th theme in Guilds: bald people. And one of those bald people is Butcher.
Butcher also fits the 5th theme of Guilds, which is, wordy cards. Take two coin tokens, you may trash a card, something something, gain a card, something something, man I'll just buy one, I'll figure out what it does when I play it. Butcher is a Remodel that you spend coin tokens to pump up. With enough coin tokens you can go straight from Curse to Colony. You can also just trade a card in for something at the same cost or less, while keeping the two coin tokens for later. There are a lot of ways you can go.
Butcher gives you a special use for coin tokens. That's not a theme of the set, that's just Butcher. It provides some coin tokens itself, so it's not like you have to have another Guilds card with it to make it do its thing. It's all been taken care of.