Marauding Maulhorn

A 5/3 for four mana is an aggressive rate, and the drawback is the price you pay for it: the Maulhorn charges in every combat whether you want it to or not, walking into bigger blockers and trading away its fragile three toughness on the defender's terms. The escape clause is the joke. The compulsion lifts only if you control a creature named Advocate of the Beast, a single specific card whose entire job is to soothe this one Beast (and a handful of others) into behaving. That naming dependency is a deliberate piece of two-card flavor design: a marauding monster that needs its keeper present to think before it swings, otherwise it simply rampages. Without the Advocate on the board, you are getting raw stats with a behavioral leash, a body built to apply pressure on an empty or developing battlefield and to embarrass you the moment the opponent stabilizes with a wall. The downside here is not a stat penalty but a loss of agency in combat: the card decides for you, and your deckbuilding has to account for the swings you cannot stop. It is the berserker template inverted into flavor, where the cure for the curse is a named guardian rather than a cost you can pay outright.