Whenever an opponent casts a spell, counter that spell and put a depletion counter on Decree of Silence. If there are three or more depletion counters on Decree of Silence, sacrifice it.
Cycling
(
, Discard this card: Draw a card.)
When you cycle Decree of Silence, you may counter target spell.
You can cycle this card even if there are no targets for the triggered ability. That’s because the cycling ability itself has no targets.