Bretagard Stronghold

Most utility lands earn their tapped-land tax by giving you an activated ability you can hold in reserve for as long as it stays legal. This one pays for itself by dying: the mana sink is a one-shot sacrifice that pumps two of your creatures, hands them vigilance and lifelink, and takes the land off the battlefield in the process. That is the trade the design is built around. You spend most of the game treating it as a green source that entered a turn slow, then, once the board is clogged, you convert the land into a Selesnya-costed combat swing that gives you two enlarged, life-gaining attackers who still hold the fort on the crack-back. The sorcery-speed restriction is what keeps it from being a combat trick: you cannot ambush a blocker or blow out an attack step, so the counters have to be planned into your main phase rather than sprung. What it wants is a wide board and a green-white manabase committed enough to hit the double-white pip, and it comes online precisely when a go-wide deck has emptied its hand but still has bodies to grow. The permanence of the +1/+1 counters is the payoff that survives the sacrifice; the land is spent, but the two creatures it grew stay grown.