Cheapest priced copy (Innistrad: Midnight Hunt): $1.99 at Card Kingdom, near mint, their price list as of .
Moonsilver Key 
Artifact · Uncommon · Innistrad: Midnight Hunt · #255
{1}, {T}, Sacrifice this artifact: Search your library for an artifact card with a mana ability or a basic land card, reveal it, put it into your hand, then shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $1.99 to $59.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 255 | Uncommon | $4.49 | $59.99 |
| Innistrad: Midnight Hunt | 255 | Uncommon | $1.99 | $3.99 |
2 rulings from Wizards of the Coast
- 24 September 2021Most mana abilities found on artifacts are activated mana abilities. An activated mana ability is an activated ability that could produce mana as it resolves, does not require a target, and isn't a loyalty ability.
- 24 September 2021Some artifacts, such as Gauntlet of Power, have triggered mana abilities. A triggered mana ability is a triggered ability that could produce mana as it resolves, triggers on the resolution of an activated mana ability or on mana being added, and doesn't require a target.