black knight cards mtg the battle is its own purpose 1x Knight of Infamy M13

This card is the good kind of bonkers

Bolass Citadel can enable some broken stuff in any mono-black deck, especially one focused around artifacts

In the later game, you can return this card to the battlefield transformed into Chaos, the Endless

You can exchange Hunter's Prowess for Descent into Avernus pretty easily, which also reduces the overall mana cost of the deck

This is a matter of taste

Unlike past years, where much of the value of the decks was tied to reprints, Commander 2018 is all about the new cards, which pushes the Esper deck to the top of the list by a decent margin, thanks mostly to Yuriko, the Tiger's Shadow being the most expensive card in the set but also some other solid-value cards, including Sower of Discord, Geode Golem, and Varina, Lich Queen