Skirsdag Cultist

The activated ability does the kind of work a sacrifice deck is built around: it converts a creature you no longer need into two damage at instant speed, repeatable as long as you have fodder and red mana to feed it. That puts it on the morbid-and-sacrifice axis red and black share, where a chump blocker, a token, or a creature already on death's door becomes a Shock you can point wherever it matters. The cost structure is what holds it back from being a free engine: the tap caps you at one activation per turn unless something untaps it, and the sacrifice clause demands a steady supply of bodies, so this is a card you build an aristocrat shell around rather than splash into anything. The 2/2 is incidental; nobody runs this for the body. What earns the slot is the loop of turning death triggers into reach, pinging a planeswalker, finishing a creature your removal left standing, or simply burning a face when the board has stalled. It is a repeatable damage outlet that doubles as a sacrifice outlet, and a deck that wants both jobs filled gets two of them in one card.