Arcanist's Sketch

With a few strokes of your paintbrush you copy the arcane symbol of a spell that has recently occurred (whether it be friendly or hostile). When a creature casts a spell, of 1st level or a Cantrip, you can use your reaction to copy that spell. Sketch now becomes that spell until the end of the day or until you take a long rest. (Since Arcanist's Sketch becomes the copied spell you are limited to the spells slots per day used.) You can only copy a spell using Arcanist's Sketch once per day.