Entropy-Slayer Chord

Cast Constraint: This spell can only be cast if Pyre-Brass planeswalker is controlled. The Nova: This spell deals 20 damage to each opponent and each creature and planeswalker they control. This damage can’t be prevented. The Great Silence: An emblem is created with “Your opponents can’t cast spells during your turn” and “Spells your opponents cast cost {3} more to cast.” Resonance Reflection: If this spell was cast while Pyre-Brass had 10 or more Resonance counters, exile all non-land permanents your opponents control instead.