I'm throwing my hat into the ring for two challenges - The Simon Says Stamp Wednesday challenge (anything goes) and the CAS(E) this Sketch challenge. Here is the sketch:
Aaaaand here is my card based on the sketch:
I created the wavy rainbow with Stitched Slopes and Hills die by Simon Says Stamp. The star is also a Simon die from this set. I had to use a stamp from one of my favorite stamp companies, Altenew.