21 printings of Izzet Signet
They range from $0.40 to $19.82 — 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.
| The List | PLST MM3-223 | — |
| Secret Lair Drop | SLD 293 | $19.82 |
| Outlaws of Thunder Junction Commander | OTC 259 | $1.19 |
| Guildpact | GPT 152 | $0.92 |
| Commander Masters | CMM 957 | $0.82 |
| New Capenna Commander | NCC 369 | $0.63 |
| Ravnica Remastered | RVR 261 | $0.61 |
| Commander 2018 | C18 207 | $0.54 |
| Duel Decks: Izzet vs. Golgari | DDJ 17 | $0.51 |
| Commander Legends: Battle for Baldur's Gate | CLB 863 | $0.51 |
| GRN Guild Kit | GK1 46 | $0.50 |
| March of the Machine Commander | MOC 362 | $0.50 |
| The Lost Caverns of Ixalan Commander | LCC 306 | $0.49 |
| Commander 2020 | C20 243 | $0.48 |
| Bloomburrow Commander | BLC 278 | $0.47 |
| Modern Masters 2017 | MM3 223 | $0.47 |
| Commander 2021 | C21 247 | $0.46 |
| Tarkir: Dragonstorm Commander | TDC 320 | $0.44 |
| Commander 2015 | C15 256 | $0.42 |
| Ravnica: Clue Edition | CLU 224 | $0.40 |
Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.