Bloodthrone Vampire

The free, repeatable sacrifice outlet is the load-bearing piece of any aristocrats deck, and this is one of the cleanest ever printed: no mana cost on the activation, no tap, no once-per-turn clamp. That distinction matters more than the body it pumps. A sacrifice outlet that costs mana throttles your loops to your land count; one that taps locks you out of combat and other abilities. Strip both restrictions and the engine runs as fast as you can feed it, which turns this into the converter that translates death triggers into a payoff. Point a Blood Artist or a Zulaport Cutthroat at it and every creature you own becomes a unit of drain; chain it through tokens and you have a board-wide sacrifice ritual that closes a game in a single turn. The +2/+2 it grants is almost incidental, a way to make sure the last creature standing carries the saved-up value into combat, but the outlet is the reason the card exists. Designs like this exist to be the throughput limiter the rest of the deck is built to exploit: mana-free, unlimited, no governor on how many bodies you can run through it in a turn. The 1/1 frame keeps it cheap enough to land early and start eating creatures before the payoffs even arrive.