8 printings of Natural Spring
They range from $0.12 to $0.38 — a 3× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Starter 1999 | S99 134 | $0.38 |
| Duels of the Planeswalkers | DPA 75 | $0.33 |
| Portal Second Age | P02 134 | $0.24 |
| Portal | POR 176 | $0.19 |
| Tempest | TMP 239 | $0.18 |
| Ninth Edition | 9ED 257 | $0.14 |
| Tenth Edition | 10E 281 | $0.12 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.