Mystic Poro (Overnumbered).

What moves the price of this card

The Mystic Poro (Overnumbered) on this page is the Foil printing from Unleashed, and it trades at $113.02 in near mint condition. The same name is on 2 other printings: Riftbound Organized Play Promotional Cards 171/298 at $1.55, Origins 171/298 at $0.30, so read the set, the number and the rarity together before comparing prices.

Condition does most of the work below the surface. A copy with soft corners or a print line off centre trades well under the market price shown here, and a copy clean enough to grade trades well above it. Before you value your own copy, look at the corners under a light and check the centring on the back, where most cards give themselves away.