Volzar, the Lightning Rod

The value of X is based on how many lightning cards you’ve played this turn when Volzar’s activated ability layer resolves on the stack, not when you first activate it.

The value of X for Amp X will not increase if you were to play additional lightning cards between resolving Volzar’s activated ability and applying the Amp X to the next time you would deal arcane damage.

Auras become permanent when they enter the arena. Aura permanents with sigil in their name that were added as defending cards to a chain link do not count towards meeting the if-condition of Volzar’s first ability.