Shauku, Endbringer

A removal engine disguised as a beater, and the design only works because every clause is a leash on the last. The activated ability is the draw: tap to exile any creature and grow, no mana required, repeatable as long as untapped. Left there, that would be absurd at this casting cost. So the card buries the cost in two places. The upkeep tax bleeds you three life every turn whether or not you use the engine, which makes Shauku a clock pointed at its own controller as much as the board. And the attack restriction is the quiet masterstroke: the card cannot attack while any other creature exists, so the 5/5 flying body it is busy growing is inert offense until you have personally exiled the entire battlefield. The engine that makes Shauku huge is the same engine that unlocks its ability to swing, which means the payoff for the life loss is a finisher you have to manufacture by clearing the table one creature per turn. It is a self-contained removal-to-attack pipeline, where each exile both shrinks the obstacles and feeds the eventual threat. Old-frame design rarely committed this hard to making a single permanent into a closed loop of its own setup, payoff, and price; the result reads less like a creature and more like a slow, lethal ritual that happens to have a body attached.