Well of Lost Dreamscard_draw$1.79A white artifact that rewards you for building a board by drawing cards, similar to The Arkenstone's ongoing value engine. It doesn't pump creatures, but it provides repeatable card advantage in the same color and mana range.
Skullclampcard_draw$4.74A premier colorless card-advantage artifact that turns creature-heavy boards into steady cards. It fills a similar utility slot as a value engine, though it is much more explosive and cheaper.
The Immortal Suncard_draw$12.05A high-end artifact anthem plus card advantage piece that boosts your team and draws extra cards each turn. It overlaps strongly with The Arkenstone as a six-mana-style board engine, but is broader and more powerful.
Karn, Scion of Urzacard_draw$6.50Creates ongoing card advantage from a colorless source and can also generate board presence. It is not an anthem, but it serves a similar role as a resilient artifact-based value engine.
Hedron Archivecard_draw$0.25A colorless mana rock that can cash itself in for card draw later, giving ramp plus refill. It is not board-wide value, but it occupies a similar artifact utility slot.
Vanquisher's Bannercard_draw$4.65A tribal-focused anthem that also draws cards whenever you cast creatures of the chosen type. If your legendary-creature plan overlaps with a creature type theme, it plays a similar support-and-draw role.
Herald's Hornutility$4.65A cheaper legendary/tribal-support artifact that helps you find creatures over time while reducing cast costs. It is a budget alternative to the search/value side of The Arkenstone's Adventure half.
Urza's Incubatorramp$17.46A strong tribal cost-reduction artifact that accelerates creature-heavy legendary strategies. It doesn't draw cards or pump directly, but it supports the same kind of board-centric plan from an artifact slot.