Once the location has been challenged and banished, characters essentially fall out of the location back into the main play area
When this card declares an attack, or if your opponent activates a monster effect (except during the Damage Step): You can excavate up to 5 cards from the top of your opponent's Deck, banish 1 excavated card, face-down, and place the rest on the top of the Deck in the same order
You can think of this kind of like the difference between a set of polygons and the bumpmap that goes on top of it, if you're familiar with 3D animation at all
It will correct 15-25% when it rotates out of Standard format
This card is geared primarily for decks that like to focus on one creature type, so Bloomburrow , a set that asks players to focus on certain creature types, seems tailor-made to this card, in a way