If a passive effect increases a unit's might to 5 or more when it enters play (making it mighty), does that trigger Volibear's Legend effect?

Ruling: Yes, if a passive effect increases a unit's might to 5 or more when it enters play, the unit will be mighty and trigger Volibear's Legend effect.

Nuances:

• This applies even if the unit doesn't have printed might of 5 or more on the card itself
• Example: Draven enters mighty and triggers Volibear if you have 2 or more points when playing him