Lux, Lady of Luminosity (Starter)

This one's down 16.3% this week and 37.1% this month, so if you're holding stock you need to decide whether to list now or sit tight for a floor. UK sellers are asking £10.89, but that's nearly double what Continental buyers will pay on Cardmarket—the spread is stark at 98% over trend. It's the third most valuable card in Origins: Proving Grounds and carries 10.9% of the entire set's value at £11.02, which explains why it's still moving despite the recent slide.

• CautionDown 16.3% this week and 37.1% this month. Still falling; list now or hold for a floor.
• NotableUK buyers pay 98% over Cardmarket for this card (3 sellers).
• Notable3rd most valuable card in Origins: Proving Grounds (of 24 priced).
• NotableThis card is 10.9% of the set's total value (£50.24).