22 printings of Regeneration
They range from $0.06 to $34.30 — a 572× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Tenth Edition | 10E 290★ | — |
| Summer Magic / Edgar | SUM 213 | — |
| 30th Anniversary Edition | 30A 506 | — |
| Seventh Edition | 7ED 265★ | — |
| Ninth Edition | 9ED 265★ | — |
| Eighth Edition | 8ED 275★ | — |
| Limited Edition Alpha | LEA 213 | $34.30 |
| Limited Edition Beta | LEB 214 | $6.97 |
| Collectors' Edition | CED 214 | $2.04 |
| Unlimited Edition | 2ED 214 | $1.01 |
| Intl. Collectors' Edition | CEI 214 | $0.97 |
| 30th Anniversary Edition | 30A 209 | $0.50 |
| Tenth Edition | 10E 290 | $0.31 |
| Revised Edition | 3ED 213 | $0.28 |
| Mirage | MIR 236 | $0.22 |
| Ice Age | ICE 259 | $0.19 |
| Fifth Edition | 5ED 321 | $0.16 |
| Ninth Edition | 9ED 265 | $0.13 |
| Seventh Edition | 7ED 265 | $0.11 |
| Fourth Edition | 4ED 268 | $0.10 |
| Eighth Edition | 8ED 275 | $0.06 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.