One fundamental challenge that has existed since the formats origin is this key difference between it and Legacy: Force of Will isnt a fair Magic card
And if theres one thing green is good at doing, its pumping mana into things
Combined with recurrence like that offered by Gisa and Geralf, and blacks frequent use of sacrifice mechanics, and you can keep that creature tapped out indefinitely
Another very critical part of leveraging stax pieces is avoiding nonbos and making sure you can break the symmetry
Oblivion Ring abilities can net some card draw, but your opponents can help you reach the seven-cards-in-exile threshold if they run commanders like Tasha, the Witch Queen, Faldorn, Dread Wolf Herald, Prosper, Tome-Bound, and more
For more on this kind of strategy, read my article on the BAE (The Boros Advantage Engine)