I personally dislike the use of singular "their" in the last sentence. The capitalisation of "Rose" might be questioned, though it is not necessarily wrong. Otherwise the sentences are correct English, though clearly they are not everyday sentences.
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GPYsingular "their" in the last sentenceI thought it referred to the coins. No? If not, I must agree with you that something is askew there.
CalifJimI thought it referred to the coins. No?Oh, OK, I thought it referred to the wizard. Would you give someone coins in exchange for the coins' conjuring something? I'm not sure.
GPYWould you give someone coins in exchange for the coins' conjuring something?Yes, I know. It's a puzzle. It seems the OP needs to rephrase something to clarify who or what is doing what.