The Ezrin Quale Trilogy

Transmutation cantrip

• Casting Time: 1 minute
• Range: 30 feet
• Components: V, S, M (up to 5 gp worth of gold, which the spell consumes)
• Duration: Instantaneous
• Classes: Bard, Druid, Sorcerer, Warlock, Wizard

Choose one piece of nonmagical gold within range that you know the exact location of, worth no more than 5 gp. The chosen gold is instantly transmuted into an equivalent weight of ordinary straw. The transformation is permanent.

Gold alloys are affected if the alloy is mostly gold.

Ezrin's Notes

I have to imagine the creator of this spell was going for the opposite. What they ended up with is a very expensive way to buy straw.