3 printings of Dwarven Catapult
They range from $0.18 to $0.78 — a 4× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Pro Tour Collector Set | PTC et51sb | $0.78 |
| Fallen Empires | FEM 51 | $0.18 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.