Does reducing the cost of a 5-cost spell with Eager Apprentice prevent Lux's Legend ability from triggering, or does the ability only look at printed cost?

Ruling: Lux's Legend ability only looks at the printed cost in the top left corner of the card. Cost reductions from cards like Eager Apprentice do not affect whether the ability triggers.

Nuances:

• Discounts are only applied when a card is being paid for; outside of payment, the game only recognizes the cost shown in the top left corner of the card.