chaotic transmutation.

the power of transmutation fills your soul and magic. for the duration, as a bonus action you can transform any amount of any material within range into anything worth under 1,000 gp with a successful ability check equal to 13 plus the cost of the summoned item divided by 100, rounded to the nearest whole number. on a fail, what you summoned turns into something random, with a 25% chance of being harmful, and a 15% chance of being an elemental, demon or devil, with a 5% chance of being a chaos wretch, an abomination that can be summoned only by this spell or means of a wish spell, with a 5% chance of targeting the caster. after the duration, the caster takes 1d4 physic damage times the total cost of what was summoned divided by 100, rounded down. if the damage exceeds half the total amount of the caster's hit points, it is reduced until the damage no longer exceeds half the caster's hit point maximum.

this spell requires concentration for the duration, and things can only be transmuted for the duration. but the transmutation lasts until dispelled, and is otherwise instantaneous. 

 if any creature is attempted to be transmuted in this way, then the caster must try and  make a DC 11+ the caster's charisma DEX save. on a fail, the caster can transmute them in any way they want. on a success, the caster then transmutes the air next to the target to the material the caster wanted to.