7 printings of Tranquil Expanse
They range from $0.08 to $0.26 — 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.
| Core Set 2019 | M19 259 | $0.26 |
| Aether Revolt | AER 189 | $0.19 |
| Starter Commander Decks | SCD 330 | $0.12 |
| Commander 2018 | C18 289 | $0.10 |
| Amonkhet | AKH 286 | $0.09 |
| Oath of the Gatewatch | OGW 180 | $0.08 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.