This could be a powerful counter to some of the basic focused decks popular right now a fact which could (and since originally writing this has) drive further value for this card
The center of the Stonehenge arena during the duel with Seto has the standard terrain type, but during the final battle, the terrain changes to either pure darkness (if you sided with the Yorkists) or the viral Crush terrain (if you sided with the Lancastrians)
However, with the current storyline featuring a giant tree thats broken into every realm in the multiverse, its more likely that Autumn Willow will slip out of a crack somewhere
The word itself tells us something about the ability, while the rest of the description of the ability tells us everything you need
Cards like Krark-Clan Ironworks and Trash for Treasure love eating artifacts, while cards like Esoteric Duplicator, Ichor Wellspring, and Servo Schematic reward you for sacrificing them