Can you play a hidden card as a reaction outside of a chain (e.g., just pop it after the beginning phase)?

Ruling: You can play a Hidden card like you would a Base Speed card on your turn (popping it without doing anything), but otherwise you must follow normal Reaction rules.

Nuances:

• Hidden cards cannot be played on the same turn they were hidden
• During showdowns, you need both focus and priority to play reactions
• On your turn, you can pop a hidden card without other actions
• In a showdown when you have priority, you can play it
• On a closed chain when you have priority, you can play it