Darkmoon Tomb

Unburden 3 (This permanent enters the battlefield with N burden counters on it. At the beginning of your upkeep, remove one burden counter from it. When this permanent has no burden counters on it, it gets +3/+3.)
At the beginning of your end step, if Darkmoon Tomb has no burden counters on it, it becomes a 1/1 black Zombie creature with spite.