If you hold a battlefield with a unit and a facedown card at the start of your turn, score a point, then move the unit away using ganking, what happens to the facedown card? Can you score the battlefield again by moving another unit there?

Ruling: The hidden facedown card is trashed immediately once you lose control of the battlefield (when all units move away). You cannot score a battlefield twice in a turn, even if you held it and then try to retake it.

Sequence:

• At start of turn, you hold the battlefield and score a point
• You move your unit away using ganking
• The facedown card is immediately trashed when you lose control
• If you move another unit to that battlefield, you do not score another point

Nuances:

• If you held a battlefield at the start of turn (scoring from holding), then lose control and retake it later that turn, you cannot score again because you already scored from that battlefield this turn
• Retaking a battlefield you already scored from this turn does not count as a "conquer" and will not trigger conquer effects