2, T, Sacrifice this artifact: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When this artifact is put into a graveyard from the battlefield, you may pay G. If you do, draw a card.
Traveler's Amuletramp$0.05A cheap artifact that fixes mana by finding a basic land and putting it into your hand. It fills the same early-game colorless ramp/filter role, though it lacks the cantrip mode.
Expedition Maputility$1.47A 1-mana artifact that tutors a land to hand, serving a very similar setup role. It trades basic-land restriction for finding any land and is a common utility upgrade.
Armillary Sphereramp$0.11Finds multiple basic lands to hand from an artifact shell, making it a close ramp/fixing cousin. It is slower up front but generates more card advantage than Horizon Spellbomb.
Wayfarer's Baubleramp$0.69A colorless artifact ramp piece that converts mana into a basic land onto the battlefield. It serves a similar early fixing/ramp purpose, but ramps directly instead of replacing itself with a card draw option.
Golden Eggcard_draw$0.24A cheap artifact that replaces itself and helps fix mana by drawing a card when it leaves the battlefield. It is more flexible than Horizon Spellbomb, though it does not fetch a land.
Chromatic Starcard_draw$0.33A classic one-mana artifact cantrip that smooths draws and mana similarly to the Spellbomb cycle. It filters mana rather than finding a land, but the self-replacing artifact role is very close.
Chromatic Spherecard_draw$0.41Another cheap artifact that fixes mana and replaces itself, fitting the same low-cost smoothing slot. It is not a land tutor, but it supports early consistency in a similar way.
Ichor Wellspringcard_draw$0.97A value artifact that draws a card when it enters and leaves the battlefield, offering strong replacement value. It is less about mana fixing and more about card economy in artifact decks.