Fomori Vault

A colorless land that taps for one and also runs a selection engine scaled to your board is a deliberate compression: it folds library manipulation into a slot that asks nothing to slide onto the battlefield. The scaling clause is where the design lives. Looking at the top X cards, X being your artifact count, means the same activation that flips through two cards in a lean deck digs six or seven deep in one built around it, so the land's reach tracks the very board state an artifact deck is trying to assemble. Note the shape of the exchange, though: you discard a card to put exactly one card into your hand, so this is filtering at parity, not card advantage. You are trading a known card for a better-chosen one, feeding the graveyard to smooth your draws, which is a cost artifact and reanimator shells often want to pay rather than one they merely tolerate. The rejected cards go to the bottom in random order, not exiled and not cleanly stacked, so the improvement is real only until you dig back down past what you passed on. Read as a mana source, it is unremarkable; read as a fixture, it is a slow, protected filtering source that survives every sweeper aimed at nonland permanents and shrugs off artifact removal that never had it as a legal target. The activation still sits on the stack like any other, but the source sits in the one permanent type opponents interact with least.