7 printings of Echoing Truth
They range from $0.17 to $0.57 — 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.
| Duel Decks: Elspeth vs. Tezzeret | DDF 66 | $0.57 |
| Modern Masters | MMA 40 | $0.39 |
| Commander 2015 | C15 93 | $0.38 |
| Darksteel | DST 21 | $0.33 |
| Dominaria United Commander | DMC 109 | $0.28 |
| The List | PLST DMC-109 | $0.17 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.