Boon of Erebos

What you buy with a single swamp and a sliver of your life total is a creature that walks out of a block it was supposed to die in, while the +2/+0 turns that survival into an ambush. Regeneration is one of black's native keywords, but the color rarely gets it stapled to an aggressive boost; on its own, regeneration is a defensive shield, a clause that shrugs off destruction and combat death. Bolt it to a power boost and the same survival becomes a weapon: the creature lives through the block, kills what blocked it, and stands ready for the next turn rather than being mourned. The two life is not incidental flavoring: it is the price black has always paid for its effects, the same self-mutilation logic that runs through the color's tutors and card draw, and here it keeps a one-mana combat trick from being free defense and free tempo at once. The instant-speed window is the load-bearing part: the package waits in hand until blocks are declared, when the attacker's information is maximal and the defender has already committed. A small card doing an unusually compact job, folding regeneration's resilience and a finishing swing into a single mana, at the cost black is most willing to pay.