Best supported result
Giant's Boulder
When this artifact enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.) {1}, {T}: Add one mana of any color. {7}, {T}, Sacrifice this artifact: Destroy target permanent.
The Boulder combines entry-time scrying, mana filtering, and an expensive answer to any permanent. Its filtering ability costs mana to activate, so it should not be described as ordinary ramp. The removal mode is a late-game option. In a deck with artifact synergies, the early filtering and card type may matter more than ever activating that final ability.
Tournament evidence: Giant's Boulder appeared in 4 Legacy decks across one event, with 13 total registered copies. 4 decks used it in the main deck and 0 used it in the sideboard. Example: Bryant_Cook in legacy league 2026 08 2410967 on 2026-08-24.
Legacy tournament pick 2
Bilbo, Thief in the Night
Spells you cast from anywhere other than your hand cost {1} less to cast. Whenever Bilbo attacks, you may cast an artifact, instant, or sorcery spell from your graveyard. If an instant or sorcery spell cast this way would be put into your graveyard, exile it instead.
Bilbo's discount rewards spells cast outside the hand, while attacking permits another artifact, instant, or sorcery from the graveyard. That makes both the mana curve and the graveyard contents relevant to evaluating a list. He still needs to survive until combat, and the recast spell still has a cost. The small recorded sample supports testing this role, not calling it a settled format staple.
Tournament evidence: Bilbo, Thief in the Night appeared in 3 Legacy decks across one event, with 9 total registered copies. 3 decks used it in the main deck and 0 used it in the sideboard. Example: Trohck in legacy league 2026 08 2410967 on 2026-08-24.