Pact of the Serpent
The tribal payoff dressed as a mono-black draw spell, with a wrinkle most black card draw skips: it can point the effect at someone else. Black has always paid life for cards, from Sign in Blood down through Night's Whisper, but those are self-contained bargains. This lets you name a creature type and target any player, which means the same cast can fill your own hand off a wide board or gut an opponent's life total by turning their tribal density into a forced draw they cannot afford. The scaling is the whole design tension: X is set by the chosen type's count on the targeted player's side, so the card is inert in a deck with no shared type and lethal in one built around a single creature type. That ties the payoff to the board state rather than to raw mana, and it rewards a commitment made several turns earlier rather than the turn it resolves. Against an opponent it functions as a punisher for go-wide tribal strategies, converting their own synergy into a life-loss engine; on yourself it is a refill that a stalled aristocrats or elf board can drain into. The color identity is honest: black gets the tribal draw the way white gets the tribal anthem, paid in the currency black has always trafficked in.
