It's a serialized version of Ragavan, Nimble Pilferer, one of the Multiverse Legends cards from the soon-to-release Magic set March of the Machine (This little monkey was just banned in Historic)
Pitch Black is a Mega Evolution era set, and the era's rates are the guide here since no large ME05-specific sample exists yet
The Vista scene is composed of five land cards shown off in Wednesday's MTG Assassin's Creed spoilers - Sunbaked Canyon, Fiery Islet, Silent Clearing, Nurturing Peatland, and Waterlogged Grove - and Ezio Auditore da Firenze's official Legendary Creature card
If you do, put a permanent card from among them onto the battlefield with a finality counter on it
Of course, there are still a few hoops to jump through, such as having your own creatures to help fuel this mind flayers machinations, but a steady supply of helpers thanks to cards like Sower of Temptation, Beguiler of Wills, and Ghoulcaller Gisa, you wont find yourself wanting