The pump ability of 2B to give deathtouch and +3/+3 means Knight of the Ebon Legion is unblockable in the early turns and absolutely immune to being double-blocked in the mid-game, lest the opponent risk a huge loss of resources
At the beginning of your end step, create a 5/5 black Demon creature token with flying, then mill two cards
One of most powerful and intriguing cards is Seymour Flux which is a slightly more expensive Phyrexian Arena that is flexible because you don't have to pay the life
Target creature gets +3/-3 until end of turn
Sure, they are card disadvantage, but they are allowed to stay, and theres something to be said for not having a threat profile, and let the others blast each other, and then rise above the masses
They're all very mana-hungry (hence the heavy ramp), but they quickly draw you an absurd amount of cards