Spine of Ish Sahremoval$0.36Colorless artifact removal that can hit any permanent, much like Unstable Obelisk’s late-game utility. It is also a reusable artifact if you can recur it.
Meteor Golemremoval$0.17A colorless catch-all answer that destroys any nonland permanent on entry. It fills the same role of universal artifact-based removal in any deck.
Nevinyrral's Diskremoval$0.81Classic colorless board-control artifact that can reset the table from a colorless slot. It is broader than Unstable Obelisk but serves a similar all-purpose removal role.
Oblivion Stoneremoval$0.65A colorless permanent-sweeper artifact that provides scalable board control. Like Unstable Obelisk, it gives decks without removal access to a universal answer.
Scour from Existenceremoval$0.18Exiles any permanent at instant speed, matching the broad 'answer anything' function. It is the spell version of the same kind of catch-all removal.
Ratchet Bombremoval$0.38A colorless artifact removal tool that can deal with a wide range of permanents depending on counters. It is cheaper upfront and serves as another universal-ish artifact answer.
Perilous Vaultremoval$0.46Colorless artifact-based exile removal for dealing with problematic permanents and boards. It is a stronger reset button, though it exiles everything rather than targeting one permanent.
Lux Cannonremoval$0.30A colorless artifact that repeatedly removes permanents once charged. It fills a similar slow-control role for decks that want a long-game artifact answer.