15 printings of Spell Blast
They range from $0.09 to $36.82 — a 409× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| 30th Anniversary Edition | 30A 376 | — |
| Summer Magic / Edgar | SUM 82 | — |
| Limited Edition Alpha | LEA 79 | $36.82 |
| Limited Edition Beta | LEB 80 | $8.09 |
| Intl. Collectors' Edition | CEI 80 | $2.99 |
| Collectors' Edition | CED 80 | $1.75 |
| 30th Anniversary Edition | 30A 79 | $0.80 |
| Unlimited Edition | 2ED 80 | $0.73 |
| Pro Tour Collector Set | PTC shr103 | $0.25 |
| Classic Sixth Edition | 6ED 100 | $0.25 |
| Tempest | TMP 89 | $0.25 |
| Revised Edition | 3ED 82 | $0.21 |
| Fifth Edition | 5ED 126 | $0.12 |
| Magic 2014 | M14 72 | $0.09 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.