Do revealed hidden units stay on the chain or get resolved instantly like other units?

Ruling: Hidden permanents are still permanents that resolve immediately upon finalizing. They do use the chain but completely skip the step that passes priority and instantly resolve.

Sequence:

• The hidden unit is revealed (using the chain)
• Priority passing is skipped
• The unit resolves immediately

Nuances:

• The reveal is not an activated ability of hidden; it's the unit itself being played
• Despite the "react with later for 0" wording and "play at any time" text, the unit doesn't wait on the chain like a reaction spell would
• This works the same way as Shen