Cheapest priced copy (Visions): $2.79 at Card Kingdom, near mint, their price list as of .
Eye of Singularity 
World Enchantment · Rare · Visions · #4
When this enchantment enters, destroy each permanent with the same name as another permanent, except for basic lands. They can't be regenerated.
Whenever a permanent other than a basic land enters, destroy all other permanents with that name. They can't be regenerated.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Visions | 4 | Rare | $2.79 | — |
3 rulings from Wizards of the Coast
- 4 October 2004If a permanent enters as a copy of another permanent, the permanent it is copying is destroyed and the copy stays on the battlefield.
- 4 October 2004Since phasing in does not cause enters abilities to trigger, it is possible to phase in a card which is already on the battlefield and not trigger this effect.
- 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.