6 printings of Sulfurous Blast
They range from $0.07 to $0.33 — a 5× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Commander Masters | CMM 262 | $0.33 |
| Time Spiral | TSP 180 | $0.32 |
| The List | PLST CMA-88 | $0.23 |
| Conspiracy: Take the Crown | CN2 170 | $0.08 |
| Commander 2011 | CMD 137 | $0.07 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.