Cheapest priced copy (Legends): $74.99 at Card Kingdom, near mint, their price list as of .
Gravity Sphere 
World Enchantment · Rare · Legends · #151
All creatures lose flying.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $74.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Legends | 151 | Rare | $74.99 | — |
2 rulings from Wizards of the Coast
- 4 October 2004It removes Flying from all creatures on the battlefield when it enters and from each creature as that creature enters. It does not prevent the Flying ability being given to the creature *after* the Sphere is on the battlefield.
- 1 October 2008This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards.