When Temporal Portal lets me repeat a hidden spell, do I pay the card's full cost or just what I paid to hide it?

If I tap Temporal Portal and then reveal a spell from hidden to repeat it, do I pay only the power I originally paid to hide the spell, or the full cost printed on the card?

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•Riftbound Community Server — Rules Questions

CostRequirements

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When Temporal Portal lets me repeat a hidden spell, do I pay the card's full cost or just what I paid to hide it?

References I found

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