Its difficult to find balance with sweepers, as they have a way of either ending the game on their own or not mattering much at all, with games where they fall somewhere in-between being rarer than either extreme
As a pure-green Commander, she really isnt all that bad, leveraging cards that give her +1/+1 counters and let you play extra lands
Then, Raise the Palisade bounces all creatures that aren't of that type back to their owners hand
This planeswalker can exile itself, too, which can protect it from a threatening board of attackers
Cards like Wasteland Strangler, Bearer of Silence, Ulamog's Nullifier, and Mindmelter will suffice
Out are Chancellor of the Spires, Sepulchral Primordial, Gonti, Lord of Luxury, and Agent of Treachery