If Voli is my legend and I play a unit with Weaponmaster that takes a weapon causing it to become mighty, does it trigger Voli's legend ability?

Ruling: No, it does not trigger Voli. Weaponmaster makes a unit mighty after it is played, so the unit is not mighty when played.

Sequence:

• Passive abilities become active just before a unit is considered "Played"
• The unit is considered played (this is when Voli would check if it's mighty)
• Weaponmaster triggers after the unit is played, making it mighty too late for Voli

Nuances:

• Units that become mighty through Passive Abilities (like Origins Draven at 2 points, or a 4:Might: unit played to Trifarian Warcamp) would trigger Voli because passives activate before the unit is considered played
• This interaction would trigger Fiora instead (Voli and Fiora are mutually exclusive)