Is "When you play me" considered a trigger ability, and can its order be determined by the player when it triggers alongside "When you play another unit" abilities?

Ruling: Yes, "When you play me" is a trigger ability, and when it triggers simultaneously with "When you play another unit" abilities, the player can determine the order of resolution.

Nuances:

• When the "When you play me" ability triggers, the unit is already in play