Monkey.D.Luffy (OP15-051).

What moves the price of this card

The Monkey.D.Luffy (OP15-051) on this page is the Normal printing from Adventure on Kami's Island, and it trades at $0.13 in near mint condition. The same name is on 8 other printings: A Fist of Divine Speed OP05-119 at $13,000, A Fist of Divine Speed OP05-119 at $5,750, Extra Booster: Anime 25th Collection EB02-061 at $5,108, Premium Booster -The Best- OP05-119 at $5,000, Awakening of the New Era ST01-012 at $5,000, The World's Strongest Warriors OP17-079 at $2,500, Carrying On His Will OP13-118 at $2,116, One Piece Promotion Cards OP12-015 at $1,867, 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.