Argoth, Sanctum of Nature

Half of a meld pair that has to justify its existence twice: once as a land you're happy to draw, and once as a creature you're building toward. The conditional enters-tapped clause (control a legendary green creature, or it enters tapped) is the tell that this was built to sit inside a legend-heavy green shell rather than any generic ramp deck; the land tolerates being a plain green source when it has to, but it comes online faster with company. Where it earns the slot is the activated ability, which turns spare mana into a body and a self-mill in one sorcery-speed click. That combination is unusual for a land: most utility lands either make mana or make a token, and paying to churn your own library on top of the token is a deliberate feed for graveyard and landfall engines rather than an afterthought. The Bear is fodder and a blocker; the mill three is the real payload, quietly stocking a yard while the land keeps producing green. The meld payoff with Titania, Voice of Gaea is the ceiling, but the design is careful to make the land stand alone: it does not brick if you never assemble the other half, which is what separates a functional meld piece from a durdly one. What you get is a land that plays like a slow value engine, priced so the token-and-mill mode reads as a late-game mana sink rather than a tempo play.