Cheapest priced copy (The Brothers' War Retro Artifacts): $0.49 at Card Kingdom, near mint, their price list as of .
Astral Cornucopia 
Artifact · Rare · Star Trek Commander · #486
This artifact enters with X charge counters on it.
{T}: Choose a color. Add one mana of that color for each charge counter on this artifact.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
10 printings · $0.49 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 157 | Rare | $0.69 | $3.99 |
| The Brothers' War Retro Artifacts | 5 | Rare | $0.49 | $2.49 |
| The Brothers' War Retro Artifacts | 68 | Rare | $0.79 | $2.49Out of stock |
| The Brothers' War Retro Artifacts | 68z | Rare | — | — |
| Commander 2016 | 243 | Rare | $0.59 | — |
| Commander Anthology Volume II | 172 | Rare | $0.49 | — |
| Edge of Eternities Commander | 131 | Rare | $0.49 | — |
| Secrets of Strixhaven Commander | 342 | Rare | $0.69 | — |
| Star Trek Commander | 338 | Rare | — | — |
| Star Trek Commander | 486 | Rare | — | — |
2 rulings from Wizards of the Coast
- 1 February 2014If you choose 1 for the value of X, Astral Cornucopia will cost {3} to cast and enter the battlefield with one charge counter. If you choose 2 for the value of X, it will cost {6} to cast and enter the battlefield with two charge counters, and so on.
- 1 February 2014The last ability is a mana ability. It doesn't use the stack and can't be responded to.