When you have multiple Zero Drives in play, do you need to track which units were banished by each specific Zero Drive, or can triggering one Zero Drive's play effect return units banished by any Zero Drive?

Ruling: Each Zero Drive can only return units that were specifically banished by that individual Zero Drive's effect. Cards can only refer to things banished by their own effects, not by other cards with the same name.

Sequence:

• When a Zero Drive banishes a unit, track which specific Zero Drive banished it
• When that Zero Drive's play effect triggers, only units banished by that specific Zero Drive can be played
• Units banished by other Zero Drives (even with the same name) remain banished

Nuances:

• Physically placing banished cards underneath their respective Zero Drive (either directly under or horizontally) is a recommended method to track which units belong to which Zero Drive