"WPN Premium Tournaments" are listed under the list of things that give you a 3x Planeswalker Points multiplier, but what does that apply to other than SCG Opens? That's the only thing I've seen that gives that multiplier.
While I don't know for certain, I'd assume the TCGPlayer events are. Running as WPN Premium is the only way, that I'm aware of, for a non-WotC circuit to have invite-only events and events with earned byes.
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Lightning Bolts don't kill creatures. State-based actions kill creatures.