Blade of the Marvelous Wizard

You imbue the weapon used as the material component of this spell with the power of transmutation, causing it to become even more deadly in battle. For the duration of the spell, the weapon deals critical hits on rolls of 19 or 20, all attacks made with the weapon have advantage, and the weapon deals an additional 3d8 damage (of the weapon's normal damage type) on a hit.

Furthermore, whenever you deal damage to a creature with the weapon they must make a constitution saving throw or begin to turn to gold. On a failed save, the creature is stunned. A creature affected by this spell gets to make an additional saving throw at the end of each of it's turns. If it fails a save while stunned, it becomes paralyzed. If it fails a save while paralyzed, it becomes petrified and turns into a golden statue. On a successful save, the effect ends on that creature, and it automatically succeeds on saving throws against this spell for the next 24 hours.

Additionally, you can use the power of the spell to transmute objects into gold. As an action, you can touch a non-magical object no larger than a 5 foot cube, causing it to turn into a golden replica of itself. This change is permanent, and the value of the object is 100gp * the object's original weight.