The Book of Vile Darkness

One of three artifacts built to be assembled, not just cast: the Eye of Vecna and Hand of Vecna are its siblings, and the payoff is a scavenger-hunt finish that most triple-artifact combo pieces never bother to promise. The end-step Zombie generation is the honest part of the card, a reward for the self-inflicted life loss that black already pays for its best effects, but the fold-together clause is where the design shows its hand. Exiling all three named pieces produces Vecna, an 8/8 indestructible God that inherits every triggered ability the exiled artifacts carried, so the reassembly is not three-cards-into-one-body so much as three engines stacked onto a single indestructible threat. What makes the mechanic work is that the three parts each function on their own first: none is a dead draw waiting for the set, so the meld-style payoff sits on top of cards you would run anyway rather than gating the whole plan behind a collection. That is the tension it resolves. Assembly rewards in Magic usually ask you to hold useless halves; this one asks you to play good pieces and quietly notices when you have all three.