Sacrifice Outlet

Creatures, artifacts, and lands that let you sacrifice a creature on demand, without paying mana, to fuel an effect: Viscera Seer scries, Ashnod's Altar and Phyrexian Altar make mana, Carrion Feeder grows itself, and Goblin Bombardment pings any target. These are the engines that turn dying creatures into a resource, the backbone of aristocrats and combo loops. Narrower than Food Outlet and Treasure Outlet, which consume Food or Treasure tokens rather than creatures. Note these are outlets that the controller activates by paying creatures as a cost, not effects that force opponents to sacrifice.