Slumbering Cerberus

A 4/2 for two mana is priced like a serious beater, and the printed rate is exactly what the drawback pays for: this Dog does not untap on its own. Left alone, it swings once and then stares at the battlefield until something dies. The morbid clause is the release valve, checking at each end step for a creature death and standing the Cerberus back up if one occurred. That folds the card into a deck already doing what red aggro wants to do anyway (trading in combat, throwing tokens under blockers, running a sacrifice outlet), so the "does it untap" question answers itself most turns you would want to attack. A body this large this early has to be conditional on something, and tying that condition to death triggers rewards the exact board states where a fast red deck is winning: it offers a genuinely oversized threat to decks willing to guarantee a corpse per turn, and punishes durdling draws that leave it tapped and useless. Morbid usually just pumps a spell or grinds incidental value; here the keyword governs whether your best early attacker is an every-turn clock or a one-swing curiosity, which is a more load-bearing job than the mechanic normally holds.