18 printings of Urza's Tower
They range from $0.84 to $42.08 — a 50× 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 330★ | — |
| Ninth Edition | 9ED 329★ | — |
| Double Masters | 2XM 372 | $42.08 |
| Antiquities | ATQ 85b | $36.56 |
| Antiquities | ATQ 85d | $27.59 |
| Antiquities | ATQ 85c | $18.05 |
| Antiquities | ATQ 85a | $15.49 |
| Fifth Edition | 5ED 429 | $2.13 |
| Modern Horizons 3 Commander | M3C 403 | $1.20 |
| Chronicles | CHR 116b | $1.17 |
| Chronicles | CHR 116c | $1.09 |
| Chronicles | CHR 116a | $1.06 |
| Jumpstart 2022 | J22 831 | $1.04 |
| Double Masters | 2XM 331 | $0.96 |
| Chronicles | CHR 116d | $0.92 |
| Ninth Edition | 9ED 329 | $0.89 |
| Commander Masters | CMM 1053 | $0.84 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.