Cheapest priced copy (The Big Score Promos): $2.29 at Card Kingdom, near mint, their price list as of .
Oltec Matterweaver 
Creature — Human Artificer · 2/4 · Mythic · The Big Score · #68
Whenever you cast a creature spell, choose one —
• Create a 1/1 colorless Gnome artifact creature token.
• Create a token that's a copy of target artifact token you control.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $2.29 to $9.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Big Score | 3 | Mythic | $2.99 | $2.99 |
| The Big Score | 33 | Mythic | $8.49 | $9.99 |
| The Big Score | 68 | Mythic | $3.49 | $4.49 |
| The Big Score Promos | 3p | Mythic | $2.29 | $2.49 |
| Wizards Play Network 2024 | 12 | Mythic | — | $2.49 |
5 rulings from Wizards of the Coast
- 12 April 2024Oltec Matterweaver’s ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
- 12 April 2024If the copied token is copying something else, then the new token enters the battlefield as whatever that token copied.
- 12 April 2024Any enters-the-battlefield abilities of the copied token will trigger when the token enters the battlefield. Any “as [this permanent] enters the battlefield” or “[this permanent] enters the battlefield with” abilities of the copied token will also work.
- 12 April 2024If the copied token has {X} in its mana cost, X is 0. (Most tokens don’t have a mana cost unless they’re copying something else.)
- 12 April 2024The new token copies the original characteristics of the target token as stated by the effect that created the target token and nothing else (unless that creature is copying something else; see below). It doesn’t copy whether the target token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.