Hidden

Hidden is a keyword that acts as a prerequisite to perform the Hide Discretionary Action.

It is present on Spells, Units, and Gear.

It is functionally short for "Rather than play this, you may pay [C] to hide this facedown at a battlefield you control that doesn't already have a facedown card hidden there. Beginning on the next player's turn, this gains [Reaction] and you may play this, ignoring its base cost."

The [C] Cost always matches the Domain Identity of the deck being played, not necessarily the card being Hidden.

Hiding a card does not open a chain, but playing a card from facedown does open a chain.

Targets chosen for the instructions on Hidden cards when played must be from the Battlefield associated with the Facedown Zone this card was Hidden in before being played.

A card with Hidden may still be played for its cost as normal, at its normal timing with no restrictions on targeting.

Multiple instances of Hidden are redundant.

Hidden, and whether or not a card has Hidden, is a characteristic of the card and may be checked or referenced by other Game Effects, independent of the state of being facedown.