Decree of Silence

Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it. Cycling 4 generic mana blue mana blue mana ( 4 generic mana blue mana blue mana , Discard this card: Draw a card.) When you cycle this card, you may counter target spell.