Does Ezreal's 'I don't deal combat damage' ability mean his might is added to the sum during showdowns but deals 0 damage, or does he not contribute his might to the sum at all (like a stunned unit)?

Ruling: Ezreal does not contribute his might to the sum during showdowns, similar to how stunned units work.

Nuances:

• The text "I don't deal combat damage" appears to function synonymously with the stun modifier for combat purposes
• Stunned units don't contribute their might to the sum (per rule 410.1.b)
• The alternative interpretation (adding might to sum but dealing 0 damage) would create unusual assignment scenarios but is considered unlikely to be the intended design