Pale yellow wisps of dream float through this small bottle, evoking the nonsensical nature of dreams. As an action, you can attach the bottle to a Tiny object (such as a weapon or a piece of jewelry) or detach it. It falls off if your attunement to it ends. You can use the shard as a spellcasting focus while you hold or wear it. 

Once per long rest when you cast a spell while you are holding or wearing the shard, you can roll on the Wild Magic Surge table in the Player's Handbook. If the result is a spell and it normally requires concentration, it doesn't require concentration in this case; the spell lasts for its full duration. If you have the Wild Magic Sorcerous Origin you may use this ability twice per long rest instead. If you do not have sorcery points and roll and 99-100 instead roll again.