Cheapest priced copy (The Brothers' War Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Digsite Engineer 
Creature — Dwarf Artificer · 3/3 · Rare · The Brothers' War Commander · #71
Whenever you cast an artifact spell, you may pay {2}. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.79 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 71 | Rare | $0.79 | — |
| Commander 2021 | 15 | Rare | $0.79 | — |
| Commander 2021 | 342 | Rare | $2.79 | — |
One ruling from Wizards of the Coast
- 16 April 2021The token gets created before the artifact spell that triggered its creation resolves. Fortunately, the token counts itself, so it's at least 1/1.