Cementerio sobrevendido

Oversold Cemetery’s ability will check your graveyard as your upkeep begins, before any player has the opportunity to take any actions. If you have fewer than four creature cards in your graveyard at that time, the ability won’t trigger at all. If the ability does trigger, it will check again as it tries to resolve. If you have fewer than four creature cards in your graveyard at that point, the ability won’t have any effect.