Courier's Briefcase

Most Treasures are throwaway rocks: one tap, one mana, gone. This one loads a full engine onto the same disposable frame. It hands you a 1/1 body the moment it lands, so cracking it later for fixing is essentially free tempo rather than a pure card-for-mana trade. The payoff, though, is deliberately gated behind a five-color activation: not five generic mana, but one of each specific color plus the tap and the sacrifice. That WUBRG requirement is the balancing hinge. It turns a two-mana artifact into a reward only a genuine five-color deck can cash, and it asks that deck to hold the Treasure rather than spend it for the fixing it desperately needs. The tension is real: the same mana that draws three cards is the mana you were counting on the artifact to help you produce. Treating it as a rainbow-fixing Treasure and treating it as a card-draw engine are close to mutually exclusive uses of a single permanent, and choosing between them is the whole decision the card poses. It is a Treasure built for the greediest manabases, the ones where hitting all five colors on demand is both the price of admission and the proof you have already solved the problem the draw mode is supposed to reward.