they are draftable per Draft Boosters while retaining the fun opening experience of finding surprise cards or card treatments per Set Boosters
K the number of success states in the population (copies of the desired card or effect in the deck)
Agent of Treachery and Terror of the Peaks spring to mind instantly
Wrexial, the Risen Deep Wrexial, the Risen Deep is a kraken with both islandwalk and swampwalk thats all about casting your opponents instants and sorceries for free whenever it deals combat damage to a player
And it helps that Hasbro owns both, so theres no sticky legal hoops to jump through to borrow licensing for one or the other
Basically Treasure Cruise is just a nerfed Ancestral Recall, but if we look back at all the other nerfed versions of it, well see that it hasnt gone that well in the past either (see Card not found, Card not found for reference)