Decree of Silence
2–3 Main · 98.3% InclusionWith Parallax Tide gone, Decree is the deck's best lock piece, and it's good in more ways than one. Landing the full Opal-Wave-Decree combo just wins on the spot, but even the simple line—pitch Decree to Attunement or Frantic Search, bring it back with Replenish—forces your opponent to claw through three countered spells to do anything.
Against control, cycling Decree for six mana is an uncounterable cantrip that strips a key counter or threat while keeping your cards flowing. Opponents often hand it to you off an Intuition pile, figuring an eight-mana enchantment is dead—then eat the cycling trigger and lose a ton of tempo. And under Opalescence, it comes down as an 8/8 finisher.
For when to run two copies versus three depending on the metagame, check the comparison on the Lists page.