6 printings of Dread Summons
They range from $0.16 to $0.43 — 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.
| Commander 2015 | C15 20 | $0.43 |
| New Capenna Commander | NCC 249 | $0.40 |
| Commander Anthology | CMA 56 | $0.40 |
| Aetherdrift Commander | DRC 90 | $0.28 |
| Foundations | FDN 604 | $0.16 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.