Four mana is a massive ask in formats like Legacy, but removal that cannot be responded to, which occasionally blows up multiple things, is worth that cost
Like you, Im a Mono-Green kinda guy, and seeing Steel Leaf Stompy keep the rest of Standard on edge is pure Magic bliss for me
This is when any damage done to your creatures would be erased
For example, the ability of Battle Squadron applies to determine Phyrexian Ingester's power and toughness, but the ability of Werebear doesn't
Of course, if you can use the mana better, you can change the symmetric effect to your advantage, and theres a chance there were decks that could do just this
Boromir, Warden of the Tower is a fresh white EDH staple that does double duty here, protecting your team and shutting down cascade shenanigans, pitch spells and any other free spells your opponents are trying to leverage