Cheapest priced copy (The Brothers' War Commander): $2.29 at Card Kingdom, near mint, their price list as of .
Tempered Steel 
Enchantment · Rare · Scars of Mirrodin · #24
Artifact creatures you control get +2/+2.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
6 printings · $2.29 to $6.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 34 | Rare | $2.49 | $2.99 |
| The Brothers' War Commander | 76 | Rare | $2.29 | — |
| DCI Promos | 62 | Rare | — | $6.49 |
| Scars of Mirrodin | 24 | Rare | $2.79 | $4.49 |
| Star Trek Commander | 241 | Rare | — | — |
| Star Trek Commander | 430 | Rare | — | — |
One ruling from Wizards of the Coast
- 7 August 2020Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to artifact creatures you control may become lethal if Tempered Steel leaves the battlefield during that turn.