Cheapest priced copy (Marvel Super Heroes Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Cosmic Crucible 
Enchantment · Rare · Marvel Super Heroes Commander · #79
At the beginning of your first main phase, add four mana in any combination of colors.
Whenever you cast a noncreature spell, you may copy it. You may choose new targets for the copy. Do this only once each turn. (A copy of a permanent spell becomes a token.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 79 | Rare | $0.49 | $0.49 |
| Marvel Super Heroes Commander | 397 | Rare | $1.29 | — |