Moonsilver Key
Artifact
, 
, 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.
To restore the day-night balance, the Celestus mechanism's Sungold Lock must be reunited with its long-lost key.
Joseph Meehan
Rulings
Some 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.
(wotc • 2021-09-24)
Most 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.
(wotc • 2021-09-24)
Rulings
Some 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.
(wotc • 2021-09-24)
Most 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.
(wotc • 2021-09-24)