Tyrite Sanctum

Godhood is normally a fixed property: a creature type printed onto a card, cared about by a small body of God-matters effects, and otherwise inert. This land turns that property into a switch. Pay two and tap, and any target legendary creature qualifies as a God, growing by a counter along the way to justify the mana spent. That conversion exists to feed the third ability, which only targets a God: type it, then spend the land itself to bolt on an indestructible counter, retiring a mana source in exchange for permanent resilience on your best legend. The God tribal plumbing (the type itself, the payoff cards that reward having one) was never deep enough to sustain a dedicated deck, which is why the durable use is the plainest one. Strip away the God-tribal framing and what remains is a colorless mana source that, over several turns and a total of six mana plus its own sacrifice, sanctifies whatever legendary threat you most want to keep alive into something removal struggles to touch. The ordering is the whole trick: the second ability guarantees the target the third ability demands, so the land builds a fortification around a single creature in stages, then dismantles itself to finish the job. A slow fortress-maker that spends most of its life passing for an ordinary colorless tap-for-mana land.