Does playing Rocket Barrage with Repeat trigger Lux, Lady of Luminosity's legend ability to draw a card?

Ruling: No. Lux's legend ability checks the printed cost of a resolved spell, not any additional or modified costs. Rocket Barrage has a printed energy cost of 4, which does not meet the threshold of 5 or more energy required to trigger Lux's ability, even when the Repeat cost is paid.

Nuances:

• The Repeat cost is an additional cost and does not change the spell's printed cost for the purpose of triggering abilities.
• Effects that determine a card's cost always use its printed cost, even if that cost is altered or ignored as the card is played.