Cheapest priced copy (The Brothers' War Retro Artifacts): $1.99 at Card Kingdom, near mint, their price list as of .
Quicksilver Amulet 
Artifact · Rare · Magic 2012 · #214
{4}, {T}: You may put a creature card from your hand onto the battlefield.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
6 printings · $1.99 to $39.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Retro Artifacts | 45 | Rare | $1.99 | $3.49 |
| The Brothers' War Retro Artifacts | 108 | Rare | $2.79 | $3.49 |
| The Brothers' War Retro Artifacts | 108z | Rare | — | — |
| Explorers of Ixalan | 44 | Rare | $3.49 | — |
| Magic 2012 | 214 | Rare | $3.99 | $7.99 |
| Urza's Legacy | 130 | Rare | $3.49 | $39.99 |
3 rulings from Wizards of the Coast
- 4 October 2004Any 'X' in the creature's cost is treated as zero.
- 1 May 2007Putting the card onto the battlefield is optional. When the ability resolves, you can choose not to.
- 22 September 2011You don't pay any costs of that creature card, including additional costs.