Bogardan Dragonheart

The trade is written into the activation: a body already on the table becomes a 4/4 flyer that swings the moment you feed it. What makes the design work is that the sacrifice and the transformation land in the same instant-speed window, so this is not a creature you grow over turns; it converts any spare attacker into four evasive haste damage exactly when you want it. Point it at a token, a chump blocker that has already done its job, or a creature about to die to removal, and that body's final purpose becomes flight and reach it never had. The activation has no once-per-turn clause, so with enough fodder you can sacrifice several creatures in a single turn: each one refreshes the Dragon's base 4/4 and its haste for the rest of the turn, though none of that removes marked damage or lifts toughness past 4, so it dies to lethal like anything else. It reads like an aristocrats payoff and a finisher folded into one two-power shell: sacrifice fodder that elsewhere just fills a graveyard here becomes offensive pressure that arrives the turn you commit it. The restraint is duration. The Dragon lasts only until end of turn, so however many creatures you pour in, you get one turn of the air out of them; it is a recurring loan against your board, never a standing upgrade.