If you play a 4 might unit directly to Trifarian War Camp, does it 'become mighty' for the purposes of Fiora's legend?

Ruling: No, the unit does not become mighty. When the unit resolves to the battlefield, Trifarian War Camp's passive is immediately applied, so there is no window where it exists as a 4 might unit before becoming 5 might.

Nuances:

• Because Trifarian War Camp has a "while" effect, the unit is immediately 5 might upon entering play
• The unit never exists as a game object on the battlefield without the War Camp passive applying
• "Becoming mighty" requires the unit to exist in play and then have its might increased, which doesn't happen here