11 printings of Underworld Dreams
They range from $2.19 to $81.86 — a 37× difference for a card with the same name. The set code and collector number printed along the bottom edge are what tell them apart.
| Eighth Edition | 8ED 168★ | — |
| Two-Headed Giant Tournament | P2HG 1 | — |
| Ninth Edition | 9ED 167★ | — |
| Legends | LEG 124 | $81.86 |
| Secret Lair Drop | SLD 1298 | $41.95 |
| Magic 2010 | M10 115 | $7.72 |
| Tenth Edition | 10E 184 | $5.60 |
| Eighth Edition | 8ED 168 | $4.38 |
| Duels of the Planeswalkers | DPA 35 | $3.75 |
| Theros Beyond Death | THB 121 | $2.19 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.