4 printings of Arcane Laboratory
They range from $0.51 to $1.55 — 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.
| Urza's Saga | USG 60 | $1.55 |
| Seventh Edition | 7ED 60 | $0.81 |
| The List | PLST 7ED-60 | $0.51 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.