Every M Blastoise card we price, most valuable first. Prices are what copies actually sold for, updated daily.
The same Pokemon is also printed as Blastoise, Dark Blastoise and Blastoise & Piplup, priced separately because the game treats them as different cards.
What a M Blastoise card is worth
The most valuable M Blastoise on this list is M Blastoise EX (Full Art) from XY - Evolutions at $69.86£52.58€61.52, and the 4 priced copies across 3 sets are worth $155£117€137 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
M Blastoise is printed in Japanese as well: 2 cards across 2 sets, the most valuable of them M Blastoise EX from Expansion Pack 20th Anniversary at $67.02£50.44€59.02. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for M Blastoise sold for $650£489.22€572.44.
If you are trying to identify which M Blastoise you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: XY - Evolutions, XY Base Set, Generations.