Oro di Venaria {X}{U}{U}
Enchantment — Aura
Enchant creature
When Venarian Gold enters the battlefield, tap enchanted creature and put X sleep counters on it.
Enchanted creature doesn't untap during its controller's untap step if it has a sleep counter on it.
At the beginning of the upkeep of enchanted creature's controller, remove a sleep counter from that creature.