Sai.

What moves the price of this card

The Sai on this page is the Normal printing from Royal Blood, and it trades at $0.03 in near mint condition. The same name is on 7 other printings: Wings of the Captain Pre-Release Cards OP06-088 at $0.61, Adventure on Kami's Island Release Event Cards OP15-045 at $0.46, Royal Blood Release Event Cards OP10-048 at $0.34, One Piece Demo Deck Cards OP01-012 at $0.25, Wings of the Captain OP06-088 at $0.08, Romance Dawn OP01-012 at $0.07, Adventure on Kami's Island OP15-045 at $0.05, 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.