Store thousands of token options in a single deck box
Pokmon TCG Evolving Skies Elite Trainer Box includes
Oh, I kill me!", "Urgh!", "I, uh, have an important appointment!", "We'll meet again!"
The win would have been anticlimactic and if the attempt failed, I would have been left with an artifacts deck with no artifacts, so I'm glad I decided to go for a longer game
If you open one of those Rares, you then have a "free pick" for whatever will improve your deck the most - an Uncommon, or that Rare/Mythic (which is now worth 20/40 gems to you)
I can perfectly imagine that decks will adapt their builds so that they are hurt less in case a bad mill from PokStop happens, but I totally see this card as a must-have for strategies like Mad Party, Zoroark Toolbox and maybe turbo decks