Among the effects that stand out the most in black's portion of the color pie are creature removal spells, tutor effects, targeted discard effects, and explosive mana generation through rituals
Anchor to Reality Axgard Armory Bitterthorn, Nissa's Animus Captain America, Liberator Cirina Bargainspinner Cloud, Midgar Mercenary Deadeye Quartermaster Fighter Class Forging the Tyrite Sword Godo, Bandit Warlord Godo, Bandit Warlord Honored Knight-Captain Kassandra, Eagle Bearer Kellan, the Fae-Blooded Kellan, the Fae-Blooded Kodama of the West Tree Nazahn, Revered Bladesmith Open the Armory Quest for the Holy Relic Raven Clan War-Axe Relic Seeker Runed Crown Steelshaper Apprentice Steelshaper's Gift Stoneforge Mystic Stonehewer Giant Strata Scythe Sun-Spider, Nimble Webber Sunforger Taj-Nar Swordsmith
If a creature connives X, its controller will draw X cards, discard X cards, then then put a number of +1/+1 counters on the conniving permanent equal to the number of nonland cards discarded this way
Search for "Samsara D Lotus" from your Deck
It also pairs really well with Karmic Guide to loop them both over and over
