Him rushing in to drive back the Nazgul is an iconic moment, giving humanity a reprieve from their terrible effect on the battlefield
Fan-favorite cards like The Scorpion God, Hapatra, Vizier of Poisons, and Murderous Redcap can finally be played under one roof
The only reason Sway isnt even more expensive right now is because its effect is more unfun than it is overpowered. Playing Sway effectively restarts the game (which most players hate), without even guaranteeing that the caster will end up in a better position than the other players at the table
I covered a wide selection of strong replacements for this in my Replacements for Commander Staples article, to make sure you can get your hands on a good mass removal spell
Invasion of Ikoria / Zilortha, Apex of Ikoria A lot of greens most powerful cards are creature tutors like Invasion of Ikoria
Szarel, Genesis Shepherd Szarel, Genesis Shepherd provides a Crucible of Worlds in the command zone, which is one of the better ways to take advantage of lands