Does Sett Brawler trigger Volibear's ability when played?

Ruling: Sett Brawler does not trigger Volibear's ability because Sett enters play with 4 might and is therefore not Mighty when he enters.

Nuances:

• A unit must be Mighty (5+ might) when it enters play to trigger Volibear's ability
• Sett Brawler enters with exactly 4 might, which is below the Mighty threshold