They include the chance at cards like borderless planeswalkers, foil and non-foil showcase cards, guaranteed foil, and guaranteed alternate frame cards
I'd be curious about also trying this in more of a Mono-White Control deck, with Carrot Cake and Enduring Innocence
Our guesses for the decks themselves revolve around the various factions in the wasteland
These are among the most reliable ramp cards that exist
Vren's ward effect helps keep it safe from removal effects, especially if you have protection and counterspells to back it up
In his base form, Jecht has Menace (he must be blocked by two or more creatures), and whenever he deals combat damage to a player, you can exile the card to return it to the battlefield transformed, on its other side