Is the second effect 'Then, if I am at a battlefield, buff all other friendly units there' a passive or a one-time active effect?

Ruling: It's a single-use trigger when the unit is played, not a passive effect.

Sequence:

• The first part of the effect resolves first
• Then the second part resolves only if legal (if the unit is at a battlefield)

Nuances:

• This is a standard WYPM (When You Play Me) trigger that resolves as normal