It also incidentally works with allies
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
Perhaps even a more obvious home is colorless decks
Eevee ex has the following attacks: Bite - 30 damage
If you just want to get some excellent, high utility Magic cards, we recommend Fetch Lands, Dual Lands, and/or Shock Lands, as your mana base is one of the most important aspects to your deck
(on Fascist Art Director, pointing out that art directors need to eat) Alan "Don't Feel Like You Have to Pick Me" Pollack (on Framed