Cheapest priced copy (Mirage): $6.99 at Card Kingdom, near mint, their price list as of .
Chaosphere 
World Enchantment · Rare · Mirage · #164
Creatures with flying can block only creatures with flying.
Creatures without flying have reach. (They can block creatures with flying.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 164 | Rare | $6.99 | — |
One ruling from Wizards of the Coast
- 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.