Comet Crawler

Most sacrifice engines let you feed them whenever you like; this one only accepts a meal when it swings. That single restriction is the whole design. The pump and whatever death payoff you chain into (aristocrat drains, treasure fodder, morbid triggers) arrive on your terms but never at instant speed on defense, which pins the card firmly to the aggressive end of black's sacrifice lineage rather than the value-grinding end. It rewards a board that already wants to attack, converting a spent token or a dying artifact into four points of lifelinked damage instead of two, and it stacks on top of whatever the sacrifice itself generates. The 2/3 body is deliberately modest so the trigger does the lifting. The "another creature or artifact" clause is what keeps it from spiraling: it cannot eat itself, so it demands you keep bringing fuel rather than snowballing off a single permanent. The lifelink is not decoration either. A deck built to throw bodies away needs a way to buy back the life it spends, and pointing lifelink at a pumped attacker is the tidiest loop the card offers: sacrifice fodder, swing for four, gain four. It belongs in the long line of black creatures that ask you to spend resources to close a game faster, closer in spirit to a beatdown enabler than an engine you leave sitting back.