Does Fiora Legend trigger her ability when a 4 Might unit is played on Trifarian War Camp, similar to how Volibear Legend triggers?

Ruling: Fiora Legend does not trigger when a 4 Might unit is played on Trifarian War Camp, even though Volibear Legend does trigger in that scenario. Fiora Legend and Volibear Legend are mutually exclusive in this interaction.

Sequence:

• When a 4 Might unit is played on Trifarian War Camp, it enters ready (already Mighty)
• Volibear Legend triggers because it sees the unit enter play
• Fiora Legend does not trigger because she needs to see a non-Mighty unit become Mighty, which is not happening here

Nuances:

• Yellow (non-Legend) Fiora uses "While I'm Mighty" language, not "become," so she will gain her text effect when played directly on Trifarian War Camp
• Fiora Legend will also not see a 4 Might unit played to War Camp as a trigger
• The Chinese translation may use "become" where the English uses "While," which can cause confusion