4 printings of Tidal Surge
They range from $0.16 to $0.72 — a 5× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Portal Second Age | P02 56 | $0.72 |
| Stronghold | STH 46 | $0.16 |
| Portal | POR 74 | $0.16 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.