Spice up the Shopkeeper's Quiz by adding another one for the Store. This new quiz can show random store items or complete sets and the user has to guess the name of the item/set or the rarity of it. This should include a full 3D preview like you normally would have in the store pages for items/sets. Obligatory - include a link to the store page for that item or set. Also, don't hold back. It's okay to show things like the Immortal Alpine Stalker's set for Ursa.