If I hide a spell (Wages of Pain) at a battlefield during my turn, then use Charm to move an opponent's unit to that battlefield to begin combat, does the hidden spell gain Reaction speed and can I play it before that combat?

Ruling: No, the hidden spell does not gain Reaction speed until the turn after you hide it, and it cannot be played at all until the following turn.

Sequence:

• Turn 1: Hide the spell at the battlefield
• Turn 2 onward: The spell gains Reaction speed and can be played

Nuances:

• Even if the hidden card were an action (not a spell), it still could not be played until the following turn