The most valuable Black Bolt card is Victini #171, worth about $623.46 in Near Mint condition, followed by Zekrom ex #172 at $595.79 and Zekrom ex #166 at $247.74. These are raw (ungraded) market prices from recent sales, updated daily. Graded copies sell for more; each card's page has its PSA, CGC and BGS prices.