7 printings of Unstable Mutation
They range from $0.09 to $4.94 — a 55× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Arabian Nights | ARN 22 | $4.94 |
| Summer Magic / Edgar | SUM 86 | $0.25 |
| Time Spiral Timeshifted | TSB 33 | $0.20 |
| Revised Edition | 3ED 86 | $0.20 |
| Fourth Edition | 4ED 110 | $0.10 |
| Ultimate Masters | UMA 80 | $0.09 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.