Stuufurs Axt

Weapon versatile Uncommon (this item requires attunement)

Me big. You can cast the Enlarge spell as a bonus action on yourself for 1 minute (no concentration required). Once you use this feature, it and the "You small" feature cannot be used again until the next dawn.

You small. When you hit a creature with this magic weapon you can cast the Reduce spell as a bonus action on the creature for 1 minute (no concentration required). Once you use this feature, it and the "Me big" feature cannot be used again until the next dawn.