Ayara, First of Locthwain

Mono-black aristocrats had a payoff problem for years: the drain triggers were there (Blood Artist, Zulaport Cutthroat), but they cost you a card each and sat around waiting to die. This is the design that consolidated the whole loop into one three-mana engine. The enters trigger fires on every black creature, so wide token strategies drain for their entire board on a single turn, and the sacrifice-to-draw activation gives you the outlet the archetype used to have to slot separately. That second ability is the quiet load-bearing piece: it turns creatures that have already done their job into refuels, so the deck stops running dry the way pre-payoff aristocrats decks always did. The triple-black cost is the honest tax. This is not a card you splash; it demands a nearly mono-black shell, which is exactly the deck it was built to reward. What makes it more than a value pile is the compression: drain, card advantage, and a sacrifice outlet all live on a 2/3 body, so a single slot does the work three cards used to. The 3 toughness matters too, keeping it above the reach of the most common one-mana removal it would otherwise fold to. The design proved durable enough that a second Ayara arrived later to extend the same drain-and-recur idea; this is the version that established the template.