The Fair Basilica

A tapland with an exit clause: once your curve is full and the white source has outlived its usefulness, two mana and the tap turn the land itself into a fresh card. The white member of a small family of lands built to smooth an opening and then convert to gas in the back half, its tempo cost paid up front by entering tapped rather than bolted on afterward as a drawback. What separates the sacrifice clause from a plain cantrip is where the card advantage lives: it sits on a land drop, so it never competes with your spells for a slot in hand and never dies to the sweepers that punish dedicated card-draw permanents. In practice it stops being a land the moment you no longer need the color, trading a source you have outgrown for a replacement at a rate cheap enough to fire without disrupting a turn. That flexibility is bounded on purpose: it draws exactly one card, sacrifices itself in the process, and asks plus the tap to do it, so the reward accrues in the long games and stays dead in the short ones. What it really poses is a deck-building question rather than a play-pattern one: how many of your lands can afford to be spells later, and how badly do you need the white right now.