Every card represents some piece of the set's story, even if it's simply a single, unnamed soldier charging into battle
The thing is, Opposition Agent isn't just shutting down powerful tutors like Demonic Tutor or Vampiric Tutor, it's also shutting down ramp spells like Nature's Lore and Sakura-Tribe Elder, Fetch Lands, Situational tutors like Fabricate and a host of other spells and abilities that commonly appear in decks
Using mana rocks and early treasure creators like Ragavan or Dockside Extortionist can make for quick ways to cast Negan from your command zone, but Kalain, Reclusive Painter is a solid, cheap alternative
This is also a great illustration with a rich scenery, quite vivid shrubbery, and the Pokmon seems to be in a "fairy tale"
You can surprise your opponents with multiple combat phases and gain an additional combat for every turn that this legendary angel attacks