Cavalier of Night

The black member of a five-part cycle that handed each color a five-mana creature carrying an enters trigger, a death trigger, and a body worth casting on its own merits. Here the two halves are built to feed each other. The enters ability asks you to sacrifice another creature to destroy an opposing threat: less a tax than a value-conversion, letting you cash in a token that has already done its job or a creature about to die anyway and aim the destruction exactly where you want it. The death trigger then reaches back for a creature card of mana value three or less, which is precisely the band that houses the small fodder and engines you were feeding to the front half. Sequence them and the card becomes self-priming: eat something small on the way in, refund something small on the way out. The 4/5 lifelink body is the connective tissue, big enough to trade up and to recoup the life black spends so freely elsewhere. This is a midrange payoff built for inevitability rather than burst: it rewards a board already cycling creatures through death and sacrifice, not one built to shelter a single threat. The more your deck treats its creatures as expendable, the more the two triggers compound into a loop you can keep running.