Nissa, Vastwood Seer // Nissa, Sage Animist
Planeswalkers that flip up from creatures were a short-lived experiment, and this is the design that best justified the mechanic. The front half is a three-drop that tutors a basic Forest: modest on its own, but it turns a legendary planeswalker into a payoff you assemble through your normal land drops rather than paying full price up front. The transform condition (seven or more lands the turn a land enters) is what makes the whole card cohere. It rewards exactly the ramp-and-fixing shell green already wants to build, so the creature side does double duty as an enabler while you cross the threshold. Once flipped, the plus-one does the thing planeswalkers rarely get to do cleanly: turn excess lands into card advantage while dropping the ones you hit straight onto the battlefield, which in turn keeps you above seven. The tension in the design is that she is fragile at every stage (a 2/2 body, a low-loyalty walker) yet almost never sits idle, because each face feeds the other. Ashaya, the Awoken World from the minus-two and the six 6/6 lands off the ultimate give the flipped card a clock and a board, but the elegance is upstream: a creature and a planeswalker sharing a single mana investment, gated behind the one number a green deck is always trying to grow anyway.
