Dragon's Herald

The whole card is a tutor pointed at exactly one address: Hellkite Overlord, an eight-mana Jund dragon you can instead deposit onto the battlefield for the cost of three small bodies and a turn's worth of mana. That specificity is the joke and the design constraint at once. A Goblin Shaman whose entire reason to exist is to cheat one named card into play is a build-around with a single destination, and the tax it charges is precise: you need a black creature, a red creature, and a green creature to feed it, which quietly mandates the same three-color identity the Overlord itself demands. It rewards the kind of board you assemble incidentally in a Jund creature deck, then converts that width into a single oversized threat. The Overlord arrives shuffled in from the deck rather than cast, so the sacrifice clause is doing the heavy lifting that mana would otherwise do: you trade three permanents you already control for a flying, trampling beater that would normally cost the back half of a game to hardcast. It is a curiosity built around a curiosity, the sort of hyper-specific tutor that treats one rare as the whole payoff and asks you to construct your entire creature base to satisfy its appetite.