Cheapest priced copy (The List): $2.49 at Card Kingdom, foil, near mint, their price list as of .
Frozen Aether 
Enchantment · Uncommon · Planar Chaos · #54
Artifacts, creatures, and lands your opponents control enter tapped.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $2.49 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 54 | Uncommon | $2.99 | $19.99 |
| The List | PLC-54 | Uncommon | — | $2.49 |
4 rulings from Wizards of the Coast
- 1 February 2007Does not affect cards that phase in.
- 1 February 2007The appropriate permanents enter tapped. They do not enter untapped and then immediately tap, therefore they do not trigger any effects due to tapping.
- 1 February 2007It affects all opponents.
- 1 February 2007It applies to cards and tokens that are put onto the battlefield by an effect, as well as ones that are played from the player's hand.