Unlike Teamwork, Untimely Transaction and "You owe me one!", you don't need a team combo to take Black Market (though it's a great moment when team synergies spontaneously arise). Black Market is just an amazing addition to many event-heavy Rogue's arsenal.
If your deck is light on skills* this is literally a Fast 1 resource draw 5 card that can't draw weaknesses**. That's incredible value at 2xp even if you end up only playing 3 of those cards. Just make sure that you and your team has sufficient actions and/or resources to play those cards you just drew, or pack low cost Fast assets and events.
Like Joe's Hunch Deck, this works better when your event selection is more generally applicable (Shortcut, Intel Report, Faustian Bargain) instead of being situation-specific tech (Money Talks, Backstab, Elusive). Cantrips like Easy Mark and Tempt Fate also doubles in value, turning the fake draw from Black Market into real draw.
You can even Double, Double it, and play another Black Market straight from Black Market to reveal 15 cards from the top of your deck! Be sure to pack an Ace in the Hole for when you do, you'll use every one of those play actions on your shopping spree.
* As is common for Preston, Sefina, Bob, and many builds running Geas
** Crystallizer users, take note!