Jund Goblins (1 player): Jund Goblins can not only go the distance with an aggressive horde of Goblins but also has the potential for infinite combos with Putrid Goblin
It follows, then, that protection from everything is profoundly powerful, as it means "this card can't be blocked, targeted, enchanted, or damaged by anything." A Creature with protection from everything can't be blocked, can't be targeted by Lightning Bolt or Slice from the Shadows, and can't be locked down by a Pacifism or Icy Manipulator
Sure, it might be a Trainer card, but is it a full art card
There are two decks to choose from in Chapter 4, an Amber & Amethyst deck themed around the Madrigals, and a Sapphire & Steel deck that is sort of Frozen-themed but a bit all over the place