Cheapest priced copy (Marvel Super Heroes): $9.49 at Card Kingdom, near mint, their price list as of .
Cosmic Cube 
Artifact · Mythic · Marvel Super Heroes · #337
Ward {2}
Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $9.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes | 245 | Mythic | $9.49 | $12.99 |
| Marvel Super Heroes | 312 | Mythic | $20.99 | $27.99 |
| Marvel Super Heroes | 337 | Mythic | $18.99 | $37.99 |