Cheapest priced copy (The List): $1.49 at Card Kingdom, near mint, their price list as of .
Angel's Trumpet 
Artifact · Uncommon · Urza's Legacy · #121
All creatures have vigilance.
At the beginning of each player's end step, tap all untapped creatures that player controls that didn't attack this turn. This artifact deals damage to the player equal to the number of creatures tapped this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.49 to $22.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | ULG-121 | Uncommon | $1.49 | — |
| Urza's Legacy | 121 | Uncommon | $1.99 | $22.99 |
2 rulings from Wizards of the Coast
- 4 October 2004It does not affect creatures which did not attack, but which are already tapped at the time the ability resolves.
- 4 October 2004Angel's Trumpet affects creatures with Defender and other creatures that can't attack for some reason.