Well, first time making a 5e spell. Hope I do well.
Spoiler: Mammon's Cash Shower
Mammonís Cash Shower
Casting Time: One action
Range: 300 ft.
Components: S, M (a handful of gold pieces (At least 10 gp))
Duration: Concentration, up to 10 minutes
Invoking the power of the archdevil Mammon, you create a large storm cloud in the shape of a cylinder that is 20 feet tall with a 10 foot radius, centered on a point you can see within range. The cloud begins to rain either copper pieces, silver pieces or gold pieces (your choice). Any creature that starts its turn in the radius or enters it must succeed on a Dexterity saving throw or take 3d10 bludgeoning damage and 1d10 of either acid (if raining copper), cold (if raining silver) or fire (if raining gold) damage. At the start of each of your turns, you can move the cloud up to 10 ft. in any direction within the spellís radius. The coins magically disappear after hitting the ground and are not usable.
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the rain deals an extra 1d10 of damage corresponding to what is raining from the cloud.