Does Ezreal's ability allow paying 1 energy instead of a power to equip gears?

Ruling: Ezreal's ability reduces optional additional costs by either 1 energy or 1 power. Equip costs are not optional additional costs, so the ability does not reduce gear equip costs.

Sequence:

• Identify if the cost is an "optional additional cost" (must say both "as an additional cost" AND "may")
• If yes, you can reduce that cost by 1 energy OR 1 power
• If no (like equip costs), Ezreal's ability does not apply

Nuances:

• The most common use cases are cards with Repeat and Accelerate keywords
• Example: A card stating "As an additional cost, you may pay 1 energy 1 power to [effect]" could have its cost reduced by either 1 energy OR 1 power