Relic Vial

The base mode is a repeatable sacrifice-for-a-card engine: three mana to cast, then two mana and a tap to turn any creature you no longer need into a fresh draw. That makes it a durable outlet for anything that wants bodies in the graveyard or triggers off death, though the activation cost is steep enough that most decks running a sacrifice theme already have cheaper ways to feed the yard. What gives the artifact its identity is the Cleric clause. Control one, and every creature death (yours, from any source, not just the ones you feed the vial) becomes a two-point life swing against each opponent. That second ability rewires the card from a value smoother into a genuine drain engine, and it costs nothing extra to run: the tribal requirement is the entire price. The design tension lives between those two modes. Without a Cleric, this is a slow, mana-hungry draw outlet that reads as filler. With one, the sacrifice ability and the passive drain start feeding each other: sacrifice a creature, draw a card, drain the table, repeat until the fodder runs out. The ceiling hides behind a creature type most decks will never care about, which is exactly why the artifact looks inert until it lands in the deck assembled to switch it on.