Nissa of Shadowed Boughs

The landfall trigger is the whole engine here: most planeswalkers climb once a turn, at sorcery speed, off their own activation, but this one gains a loyalty counter every time a land enters under your control. Play a land, tick her up; crack a fetch or bounce a land back down, tick her up again, all without spending an activation. That matters because she casts at four loyalty and her ultimate costs five, so she is one land drop away from firing the moment she resolves: hit your drop the turn she enters, and the minus is live immediately rather than three activations off. It also pushes toward a deck stuffed with extra land drops rather than a single one per turn. The minus scales its ceiling off your land count instead of a fixed number, so the pool of creatures you can pull onto the battlefield widens the longer the game runs (the creature always arrives with exactly two +1/+1 counters, above its printed rate regardless of when you fire). The +1 is the workhorse: it untaps a land, so the mana is never wasted, and it can turn that land into a hasty 3/3 with menace for a swing. The body reverts before your opponent's combat, which marks it as a reach tool rather than a blocker to shield her loyalty. Every line rewards the same instinct, keep making land drops, which sits her squarely in the Golgari tradition that treats flooding as fuel rather than failure.