Baxter Building

A colorless source that enters untapped and does the minimum a nonbasic can offer off the tap, then buries two escalating four-mana modes under that plain body. The first is a color filter rather than ramp: pay four generic and tap to convert it into four mana in any combination, splitting a monochrome or colorless pool into whatever your hand actually demands. The count works against you, though: four mana in plus the tap of the land itself is five potential mana spent to make four, so you come out down one on volume and long on flexibility, and the trade only makes sense once you already have surplus mana to feed it. The second mode carries the card's identity: a repeatable card-draw tap gated behind a board condition unusual among lands, since you must control a creature with toughness 4 or greater to fire it. That toughness clause is the whole balancing act. It welds a land's late-game card advantage to your board actually holding a durable body, so the faucet only opens for decks fielding big, sticky creatures rather than a control shell content to sit behind interaction. The land does not build you toward that plan; it pays off once you are already standing in it. Both taps are separate expensive activations that never overlap on a turn, which keeps it firmly among the lands that stop being fixing and become mana sinks once the game slows down.