Endling

A mana sink built as a modular toolbox, where each activation converts leftover mana into a different combat verb read off the board state rather than the deck list. The design descends from the Morphling lineage of creatures that spend open mana on evasion and survivability at instant speed, but where those cards leaned on blue's untap-and-bounce vocabulary, this one is drawn almost entirely in black: menace to shove damage past a wall of blockers, deathtouch to make any block a losing trade, undying to walk back after a removal spell. The fourth mode is the outlier, and not just because it costs generic mana instead of another black symbol; it never adds net stats and never places a counter, which is exactly what lets it coexist with undying, since the recursion only checks for +1/+1 counters and this pump leaves none behind. Instead of growing the body it retunes it mid-combat, shifting a point of power for a point of toughness in either direction to solve a lethal math problem or survive a burn spell one point short. The catch is that a 3/3 is only as threatening as the mana you can leave open, and three of its four verbs demand black specifically, so the flexibility is throttled by how black your mana base runs. It answers "what should I do with my last two mana" with four different replies, and picks among them on the fly.