The ability to exchange one resource for another gives players plenty of choice on how best to use their creatures, lands, and spells to find winning combinations (more info on the theory behind that here)
Raging Bolt ex was not a great strategy during the "Temporal Forces" format, but this deck became a threat when Teal Mask Ogerpon was released, making the strategy able to consistently get more energy on the board while also drawing cards
I'll break down the top cards worth opening, along with a few honorable mentions worth keeping an eye out for
The two drop is three to activate, sacrifice of one dork, and then no life gain, so it's worse, but doesn't require black mana to activate
(2016-08-23) There are several ways to secretly name a card, including writing the name on a piece of paper that's kept with the face-down conspiracy
It tends to show up with commanders like Eriette of the Charmed Apple, Aminatou, Veil Piercer, and Light-Paws, Emperor's Voice, and its very close to an auto-include with the latter