Does Ezreal's discount let you play Nami without spending power?

If I use Ezreal, Prodigy Explorer's power discount on Nami, Tidecaller's optional additional cost, do I need to spend power to play Nami at all? Can I choose not to use Vex's discount when it applies?

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•Riftbound Community Server — Rules Questions

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Does Ezreal's discount let you play Nami without spending power?

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