If a player has a hidden card at a battlefield where they control it with a single unit, and that unit is forced back to base during the main phase, does the hidden card immediately go to the discard pile?

Ruling: The hidden card goes to the discard pile after the effect that removed the unit resolves. Until the effect resolves, the unit is still at the battlefield maintaining control.

Sequence:

• Effect that forces unit back to base is played/triggered
• Effect resolves, removing the unit
• After resolution, player no longer has control
• Hidden card is discarded