Jiang Yanggu, Wildcrafter

Counters usually measure combat: a bigger body, better math in the red zone. The static here repurposes them as an on-switch for mana production, so every creature you grow into a +1/+1 counter becomes a Llanowar Elves that also happens to be a threat, and one that taps for any color at that. The minus feeds the same engine, planting a counter on one of your creatures to light up a fresh mana source. That is the shape the card runs on: it has no plus ability, so it can only shed loyalty, never build it. Starting at three and dropping one per activation, it is a walker with a deliberately short clock, spending itself down to grow the board and turn that growth into ramp. The static sits idle until counters are already on your side of the table, whether from the minus, from other counter sources, or from creatures that arrive with counters attached. That makes it a support piece for a counters-matter shell rather than a splash-in value planeswalker: it converts incidental growth into color-fixing and explosive mana, but only for the creatures you control, and only once they are already growing. It rewards a board already committed to the theme, one where the ramp comes free with the beatdown, not one hoping a three-mana planeswalker will carry the turn on its own.