If I have a Sprite token at a Battlefield with a Hidden card there, can I play the Hidden card when my turn begins before the token is removed, or is the token removed automatically discarding the Hidden card?

Ruling: You can react to the Temporary trigger by flipping the Hidden card before the token is removed.

Sequence:

• Temporary trigger occurs at the beginning of your turn
• You can flip the Hidden card in response to this trigger
• If it's a unit, you can even score by holding this way since the Temporary trigger happens before scoring
• The token is then removed