Baron Helmut Zemo

That Boast cost is a joke told with a straight face. Fifteen or more black mana symbols spread across the cards you exile is not a threshold you clear by accident; it is a construction target, one that all but demands you build a graveyard stuffed with the heaviest devotion payloads black has ever printed and then attack with a 3/3 to earn the right to unload them. Clear it, and the reward is genuinely lopsided: copy every exiled card and cast up to three of the copies for free, a payoff scaled to how absurd the entry fee was. The connive trigger is the connective tissue between the two halves. Every black spell you cast from hand loots and grows the body, filling the graveyard with the very fuel the Boast wants while inching Zemo toward a lethal swing. The design tension is that both abilities pull the same direction: you cast black spells to enable connive, connive stocks the yard, the yard feeds the Boast, and the Boast is only live if you committed to the attack. It is a build-around that punishes half-measures, a villain whose payoff is proportional to the seriousness with which you take the assignment. Nothing here works on a light black splash; the fifteen-symbol clause is the wall that keeps the copy engine from being cheap.