Can a hidden Tideturner be activated during the beginning step to react to a Sprite token's Temporary trigger in order to score a point for holding a battlefield?

Ruling: Yes, you can activate a hidden Tideturner during your beginning step by chaining it to the Sprite token's Temporary trigger to score the point for holding the battlefield.

Sequence:

• During beginning step, the Sprite token's Temporary ability triggers
• The hidden Tideturner can be activated in reaction to this trigger
• This allows scoring the point for holding before the Sprite is removed

Nuances:

• Hiding a card is not the same as playing a card
• Temporary is a triggered ability that can be reacted to