Vivien, Arkbow Ranger

A three-green cost on a four-mana walker is the first thing worth noticing: this is a planeswalker built to be cast off green mana dorks in a color-committed shell, not a splash. The +1 does the quiet structural work most green walkers only gesture at, handing out counters and trample so a board of small bodies punches through gang blockers instead of chumping into a stall. The -3 is where she earns her keep as removal, and its shape is precise: it is one-way damage, not a fight, so the targeted creature deals its power to whatever you point it at and takes nothing back. That distinction matters, because it turns your own attackers into safe, repeatable, loyalty-priced removal that reaches planeswalkers as readily as creatures, unusual for a green answer at all. And because the damage scales with the targeted creature's power rather than a fixed number, it feeds directly off the board the +1 has already inflated; the two halves compound. The -5 fetches a creature card from outside the game, an ability bounded almost entirely to sanctioned formats that permit such reaches, and one that in ordinary play mostly marks a ceiling Vivien rarely survives to touch. What defines her is that pairing on a low loyalty base: a one-directional damage engine and a counter-based pump, a green walker that answers threats by aiming your creatures at them rather than casting a spell to do the killing.