Looking back now, 5 mana is an awful lot to ask of an enchantment that doesnt do anything when it enters the battlefield, but if allowed to sit on the battlefield after a board wipe or a couple turns of play from an Aristocrats strategy (decks that derive value from sacrificing creatures), Black Market can quickly generate game-winning amounts of black mana
$1.79 General Ferrous Rokiric (Showcase) Modern Horizons 2 Variants $0.79 Niv-Mizzet, Supreme March of the Machine: The Aftermath $0.59 Niv-Mizzet, Guildpact (Showcase Ravnica City) Murders at Karlov Manor Variants $1.29 Stump Stomp Modern Horizons 3 $0.49 Niv-Mizzet, Guildpact Murders at Karlov Manor $0.99 Iridian Maelstrom Dominaria United Commander Decks $0.79 Niv-Mizzet, Supreme (Showcase) March of the Machine: The Aftermath Variants $1.49 Niv-Mizzet, Supreme (Extended Art) March of the Machine: The Aftermath Variants $1.29 Jhoira, Weatherlight Captain Edge of Eternities Commander Decks $1.29 Ramos, Dragon Engine Foundations $0.49 Infinite Guideline Station Edge of Eternities $1.79 General Ferrous Rokiric Modern Horizons 2 0 results found
Same caveat applies that this is probably much better if the formats slow, which makes it a more appealing Sealed card
It may be tempting to stack everything onto your commander and start swinging, but that can make Killian a huge target very quickly
#1: Yawgmoths Will Yawgmoths Will can be easy for non-Vintage players to underestimate since so many lists seem to feature just two Yawgmoths Wills, even when people could have played four
