Buried Ruin

A colorless source that doubles as a one-shot Regrowth for artifacts, payable once the land has stopped pulling its weight as a mana source. The structure is the appeal: it taps for mana like any other land for as long as you need it, then cashes itself in to return the artifact you most want back, folding card advantage into a slot that costs nothing in your color requirements. That last clause is what lets it survive in nearly any artifact-heavy deck: the activation runs two generic plus the land, so a colorless source doing this much barely strains a manabase. The recursion returns the card to hand rather than the battlefield, which keeps it honest against the most explosive replay loops; you have to recast whatever you fetch, paying for it again. And because the ability carries no timing restriction beyond a tap, you can hold it open and crack it at instant speed: a destroyed equipment or mana rock can be bought back the moment it hits the bin, or during an opponent's turn to dodge sorcery-speed disruption. It sits in a quiet lineage of utility lands that recur a specific permanent type, the kind of effect that does nothing flashy but turns a graveyard full of dead equipment, mana rocks, and combo pieces into a renewable resource.