When Nocturne is revealed after his errata, does he need to be played immediately or just that turn?

Ruling: After the errata, Nocturne's ability is no longer a triggered ability with "when" timing. He gets banished when revealed, and you can play him for a power, but it doesn't need to happen immediately.

Sequence:

• Nocturne is revealed
• He gets banished
• The ability that caused you to find him finishes resolving
• You can then play him for a power

Nuances:

• The ability no longer uses "when" so it's not a triggered ability that must resolve immediately
• Once he begins the process of playing himself, that does use the chain