Sevyn's Hat of Wizardry

This vibrant purple hat, festooned with feathers, stars and spangles, serves as a spellcasting focus.
While attuned to the hat, you gain +1 to Spell Attack rolls and Spell Save DCs.
Twice per long rest, you can attempt to cast
any cantrip or L1 spell from the Wizard spell list that you do not already know, provided you succeed on a DC 11 Arcana check.