Can you cast Consult the Past even if a showdown never occurs on the opponent's turn?

Ruling: No, you cannot cast Consult the Past if a showdown never occurs on your opponent's turn. You need priority to play reactions, and on your opponent's turn you only get priority during showdowns or when there's a chain with an item on it.

Sequence:

• If the opponent never creates a chain with a spell or ability, or never starts a showdown, you never have priority
• Playing a unit creates a chain but it immediately resolves and closes unless the unit has a WYPM ability
• You need a spell or ability to create the chain (or a unit that triggers an ability when played) in order to play the reaction

Nuances:

• There is no passing of priority when trying to end your turn