Considering that both cards are in print and, discounting the Aftermath debacle, is from Magic's newest set, I'd lean towards selling while prices are high unless you plan on building the deck yourself
As an extra upside, Maelstrom Wanderer grants all your creatures haste, so every creature you hit off of the eight-mana Maelstrom Wanderer can attack the turn it resolves.
Each is a curated set rather than random selection of cards, built around a theme, such as "Pirates" or "Unicorns"
Break the World In many different builds of the both the Enduring Ideal deck and different attempts at Prison, one of the things that had seemed to be really exciting was that we appeared to be in a world where creature-kill overkill was really great
However, this is the first time well actually get to see blatant references, characters and even more nods to Dungeons & Dragons world of the Forgotten Realms within Magic: The Gathering