Arceus & Dialga & Palkia GX

Raw copies of this card have actually shifted at £614 in the UK market—two sales in the last 90 days, most recently on 24 Aug—which aligns precisely with your asking price of £613.78. There's no stock listed locally or graded sales to reference in the past month, so Cardmarket at £519.81 is the only real comparison point, though that's notably lower. It's the most valuable card in Alter Genesis by a distance, representing 34.8% of the entire set's value, which tells you how scarce and sought-after this one is.

• NotableNo UK listings or graded sales in the last 30 days. Cardmarket is the only reference.
• NotableRaw copies actually sell for £614 (2 UK sales in 90 days, latest £614 on 24 Aug).
• Notable1st most valuable card in Alter Genesis (of 117 priced).
• NotableThis card is 34.8% of the set's total value (£1,495).