Mill or sacrifice your own lands into the graveyard, gaining life along the way, then grind value off landfall and land recursion. If you assemble Argoth, Sanctum of Nature and stock four+ lands in the graveyard, you meld into Titania, Gaea Incarnate, returning every land from your yard and making a 5/3 for each, often ending the game on the spot.
Free incidental lifegain from any land hitting your graveyard, including fetches and self-mill
Backs a powerful lands/landfall engine with a built-in payoff in the meld
Mono-green gives access to the best ramp, recursion, and big mana in the format
Resilient: lands in the graveyard are an asset, not a liability
Meld requires assembling two specific pieces, making it slow and fragile to disruption
Front side does little on its own beyond lifegain and reach
Mono-green struggles with interaction, removal, and protecting key pieces
Graveyard hate cripples both the lands engine and the meld