Currently, the most expensive Umbreon card in existence is the Sword & Shield Evolving Skies Special Illustration Rare valued ...

Ditto’s chosen disguises changes from time to time, so you’ll want to make sure you know what the disguises are currently if you’re Ditto hunting — especially if you are after a shiny.

UPDATE: We've put together some new decks using the Space-Time Smackdown expansion and added them to this list. These include deck guides for Cresselia ex, Yanmega ex, Darkrai ex and Weavile ex ...